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Consolidated Balance Sheets - USD ($) $ in Thousands	Aug. 31, 2011	May 31, 2011
Current Assets
Cash and cash equivalents	$ 6,491	$ 10,879
Accounts receivable, net	72,706	78,031
Inventories, net	10,226	9,830
Deferred income taxes	1,282	1,278
Prepaid expenses and other current assets	6,825	6,761
Total current assets	97,530	106,779
Property, plant and equipment, net	52,750	49,168
Intangible assets, net	28,163	27,304
Goodwill	68,970	64,146
Other assets	1,104	1,240
Total assets	248,517	248,637
Current Liabilities
Current portion of long-term debt	6,551	7,226
Current portion of capital lease obligations	6,526	5,853
Accounts payable	5,580	6,656
Accrued expenses and other current liabilities	29,020	28,028
Income taxes payable	2,365	2,825
Total current liabilities	50,042	50,588
Long-term debt, net of current portion	9,495	14,625
Obligations under capital leases, net of current portion	11,047	9,623
Deferred income taxes	2,920	2,863
Other long-term liabilities	3,719	3,452
Total liabilities	77,223	81,151
Commitments and contingencies
Preferred stock, 10,000,000 shares authorized
Equity
Common stock, $0.01 par value, 200,000,000 shares authorized, 27,712,038 and 27,667,122 shares issued and outstanding as of August 31, 2011 and May 31, 2011, respectively	277	277
Additional paid-in capital	181,521	180,594
Accumulated deficit	(10,789)	(14,017)
Accumulated other comprehensive income (loss)	(7)	303
Total Mistras Group, Inc. stockholders' equity	171,002	167,157
Noncontrolling interest	292	329
Total equity	171,294	167,486
Total liabilities, preferred stock and equity	$ 248,517	$ 248,637

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Aug. 31, 2011	Aug. 31, 2010
Revenues:
Services	$ 82,902	$ 61,252
Products	8,545	7,158
Total revenues	91,447	68,410
Cost of revenues:
Cost of services	56,887	41,391
Cost of products sold	3,640	3,277
Depreciation related to services	3,323	2,809
Depreciation related to products	177	155
Total cost of revenues	64,027	47,632
Gross profit	27,420	20,778
Selling, general and administrative expenses	19,381	15,479
Research and engineering	589	555
Depreciation and amortization	1,479	1,178
Legal reserve		250
Income from operations	5,971	3,316
Other expenses
Interest expense	661	690
Income before provision for income taxes	5,310	2,626
Provision for income taxes	2,116	1,054
Net income	3,194	1,572
Net loss attributable to noncontrolling interests, net of taxes	34	20
Net income attributable to Mistras Group, Inc.	$ 3,228	$ 1,592
Earnings per common share (see Note 4):
Basic (in dollars per share)	$ 0.12	$ 0.06
Diluted (in dollars per share)	$ 0.11	$ 0.06
Weighted average common shares outstanding:
Basic (in shares)	27,677	26,664
Diluted (in shares)	28,225	26,778

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Total Mistras Group, Inc. Stockholders' Equity	Common Stock	Additional paid-in capital	Retained earnings (accumulated deficit)	Accumulated other comprehensive income (loss)	Noncontrolling Interest	Comprehensive Income
Balance at May. 31, 2010	$ 130,554	$ 130,286	$ 267	$ 162,054	$ (30,448)	$ (1,587)	$ 268
Balance (in shares) at May. 31, 2010			26,664
Increase (Decrease) in Stockholders' Equity
Net income	1,572	1,592			1,592		(20)	$ 1,572
Other comprehensive income, net of tax:
Foreign currency translation adjustment	(210)	(210)				(210)		(210)
Comprehensive Income	1,362	1,382					(20)	1,362
Stock compensation	729	729		729				729
Noncontrolling interest in subsidiary	117						117
Balance at Aug. 31, 2010	132,762	132,397	$ 267	162,783	(28,856)	(1,797)	365
Balance (in shares) at Aug. 31, 2010			26,664
Balance at May. 31, 2011	167,486	167,157	$ 277	180,594	(14,017)	303	329
Balance (in shares) at May. 31, 2011			27,667
Increase (Decrease) in Stockholders' Equity
Net income	3,194	3,228			3,228		(34)	3,194
Other comprehensive income, net of tax:
Foreign currency translation adjustment	(313)	(310)				(310)	(3)	(313)
Comprehensive Income	2,881	2,918					(37)	$ 2,881
Stock compensation	1,002	1,002		1,002
Stock compensation (in shares)			4
Net settlement on vesting of restricted stock units	(281)	(281)		(281)
Net settlement on vesting of restricted stock units (in shares)			36
Excess tax benefit from stock compensation	151	151		151
Exercise of stock options	55	55		55
Exercise of stock options (in shares)			5
Balance at Aug. 31, 2011	$ 171,294	$ 171,002	$ 277	$ 181,521	$ (10,789)	$ (7)	$ 292
Balance (in shares) at Aug. 31, 2011			27,712

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2011	Aug. 31, 2010
Cash flows from operating activities
Net income attributable to Mistras Group, Inc.	$ 3,228	$ 1,592
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	4,979	4,142
Deferred income taxes	146	(24)
Provision for doubtful accounts	85	105
Gain on sale of assets	(12)	(9)
Amortization of deferred financing costs	42	42
Stock compensation expense	1,002	729
Interest rate swap		89
Noncontrolling interest	(34)	(20)
Foreign currency loss (gain)	5	(17)
Changes in operating assets and liabilities, net of effect of acquisitions of businesses
Accounts receivable	5,940	3,140
Inventories	(323)	(189)
Prepaid expenses and other current assets	180	942
Other assets	144	937
Accounts payable	(1,358)	281
Income taxes payable	(455)	(938)
Accrued expenses and other current liabilities	(770)	(1,561)
Net cash provided by operating activities	12,799	9,241
Cash flows from investing activities
Purchase of property, plant and equipment	(3,103)	(1,877)
Purchase of intangible assets	(130)	(86)
Acquisition of businesses, net of cash acquired	(5,628)	(5,301)
Proceeds from sale of equipment	68	24
Net cash used in investing activities	(8,793)	(7,240)
Cash flows from financing activities
Repayment of capital lease obligations	(1,632)	(1,459)
Repayment of long-term debt	(2,047)	(1,642)
Net repayments against revolver	(3,850)
Repayments of other short-term borrowings	(1,014)	(960)
Taxes paid related to net share settlement of equity awards	(281)
Excess tax benefit from stock compensation	151
Proceeds from the exercise of stock options	55
Net cash used in financing activities	(8,618)	(4,061)
Effect of exchange rate changes on cash and cash equivalents	224	(122)
Net change in cash and cash equivalents	(4,388)	(2,182)
Cash and cash equivalents
Beginning of period	10,879	16,037
End of period	6,491	13,855
Supplemental disclosure of cash paid
Interest	621	750
Income taxes	2,294	3,530
Noncash investing and financing
Equipment acquired through capital lease obligations	$ 3,598	583
Issuance of notes payable and other debt obligations primarily related to acquisitions		$ 1,637

Description of Business & Basis of Presentation

3 Months Ended

Aug. 31, 2011

Description of Business & Basis of Presentation

Description of Business & Basis of Presentation

1. Description of Business & Basis of Presentation

Description of Business

Mistras Group, Inc. and subsidiaries (the Company) is a leading “one source” global provider of technology-enabled asset protection solutions used to evaluate the structural integrity and reliability of critical energy, industrial and public infrastructure. The Company combines industry-leading products and technologies, expertise in mechanical integrity (MI) and non-destructive testing (NDT) services and proprietary data analysis software to deliver a comprehensive portfolio of customized solutions, ranging from routine inspections to complex, plant-wide asset integrity assessments and management. These mission critical solutions enhance customers’ ability to extend the useful life of their assets, increase productivity, minimize repair costs, comply with governmental safety and environmental regulations, manage risk and avoid catastrophic disasters. Given the role our services play in ensuring the safe and efficient operation of infrastructure, the Company has historically provided a majority of its services to its customers on a regular, recurring basis. The Company serves a global customer base of companies with asset-intensive infrastructure, including companies in the oil and gas, fossil and nuclear power, alternative and renewable energy, public infrastructure, chemicals, aerospace and defense, transportation, primary metals and metalworking, pharmaceuticals and food processing industries.

The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (GAAP) for interim financial information. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair statement have been included. Operating results for the three months ended August 31, 2011 are not necessarily indicative of the results that may be expected for the year ending May 31, 2012. The balance sheet at May 31, 2011 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by GAAP for complete financial statements. You should read these unaudited consolidated financial statements together with the historical consolidated financial statements of the Company as filed with the Securities and Exchange Commission.

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of Mistras Group, Inc. and its wholly or majority-owned subsidiaries. Where the Company’s ownership interest is less than 100%, the noncontrolling interests are reported in stockholders’ equity in the accompanying consolidated balance sheets. The noncontrolling interest in net income, net of tax, is classified separately in the accompanying consolidated statements of operations.

All significant intercompany accounts and transactions have been eliminated in consolidation. All foreign subsidiaries’ fiscal years end on April 30, while Mistras Group, Inc. and the domestic subsidiaries’ fiscal years end on May 31. The effect of this difference in timing of reporting foreign operations on the consolidated results of operations and consolidated financial position is not significant.

Reclassification

Certain amounts previously reported in prior periods have been reclassified to conform to the current year presentation. Such reclassifications did not have a material effect on the Company’s financial condition or results of operations as previously reported.

Revision of Prior Period Financial Statements

We have revised our consolidated statement of cash flows for the quarter ended August 31, 2010 to reflect the cash flows associated with the financing of an insurance premium as cash flows from financing activities. Such cash flows were previously reported in operating activities. A summary of the revisions to the consolidated statements of cash flows for the three months ended August 31, 2010 is as follows:

	As previously reported			Revision			As revised

Net cash flows provided by operating activities	$	8,281		$	960		$	9,241
Net cash flows used in investing activities	(7,240		)	—			(7,240		)
Net cash flows used in financing activities	(3,101		)	(960		)	(4,061		)
Effects of exchange rate changes on cash and cash equivalents	(122		)	—			(122		)
Net increase in cash and cash equivalents during the period	(2,182		)	—			(2,182		)

A similar revision has been made to the six and nine-month periods ended November 30, 2010 and February 28, 2011, which will be reflected in our second and third quarterly filings of fiscal 2012. The impact of these revisions in the six and nine-month periods ending November 30, 2010 and February 28, 2011 was a decrease of approximately $2.1 million and $2.7 million, respectively, to net cash flows provided by operating activities with a corresponding increase to net cash flows provided by (used in) financing activities. These revisions had no impact on our annual statement of cash flows as presented in our 2011 Form 10-K.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 2-6
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Name Statement of Position (SOP)
-Publisher AICPA
-Number 94-6
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Name FASB Interpretation (FIN)
-Publisher FASB
-Number 46R
-Paragraph 4, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 205
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-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6359553&loc=d3e288-107754

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Summary of Significant Accounting Policies

3 Months Ended

Aug. 31, 2011

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Revenue Recognition

Revenue recognition policies for the various sources of revenues are as follows:

Services

The Company predominantly derives revenues by providing its services on a time and material basis and recognizes revenues when services are rendered. At the end of any reporting period, there may be earned but unbilled revenues that are accrued. Payments received in advance of revenue recognition are reflected as deferred revenues.

Software

Revenues from the sale of perpetual licenses are recognized upon the delivery and acceptance of the software. Revenues from term licenses are recognized ratably over the period of the license. Revenues from maintenance, unspecified upgrades and technical support are recognized ratably over the period such items are delivered. For multiple-element arrangement software contracts that include non-software elements, and where the software is essential to the functionality of the non-software elements (collectively referred to as software multiple-element arrangements), the Company applies the rules as noted below.

Products

Revenues from product sales are recognized when risk of loss and title passes to the customer. The exceptions to this accounting treatment would be for multiple-element arrangements (described below) or those situations where specialized installation or customer acceptance is required. Payments received in advance of revenue recognition are reflected as deferred revenues.

Percentage of Completion

A portion of the Company’s revenues are generated from engineering and manufacturing of custom products under long-term contracts that may last from several months to several years, depending on the contract. Revenues from long-term contracts are recognized on the percentage-of-completion method of accounting. Under the percentage-of-completion method of accounting revenues are recognized as work is performed. The percentage of completion at any point in time is based on total costs or total labor dollars incurred to date in relation to the total estimated costs or total labor dollars estimated at completion. The percentage of completion is then applied to the total contract revenue to determine the amount of revenue to be recognized in the period. Application of the percentage-of-completion method of accounting requires the use of estimates of costs to be incurred for the performance of the contract. Contract costs include all direct materials, direct labor costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs, and all costs associated with operation of equipment. The cost estimation process is based upon the professional knowledge and experience of the Company’s engineers, project managers and financial professionals. Factors that are considered in estimating the work to be completed include the availability and productivity of labor, the nature and complexity of the work to be performed, the effect of change orders, the availability of materials, the effect of any delays in our project performance and the recoverability of any claims. Whenever revisions of estimated contract costs and contract values indicate that the contract costs will exceed estimated revenues, thus creating a loss, a provision for the total estimated loss is recorded in that period.

Multiple-element Arrangements

The Company occasionally enters into transactions that represent multiple-element arrangements, which may include any combination of services, software, and hardware. When a sales arrangement contains multiple elements, such as hardware and services and/or software products, the Company allocates revenue to each element based on a selling price hierarchy. The selling price for a deliverable is based on its vendor specific objective evidence (VSOE) if available, third party evidence (TPE) if VSOE is not available, or estimated selling price (ESP) if neither VSOE nor TPE is available. The Company has historically utilized the VSOE due to the nature of its products. In multiple element arrangements where more-than-incidental software deliverables are included, revenue is allocated to each separate unit of accounting for each of the non-software deliverables and to the software deliverables as a group using the relative selling prices of each of the deliverables in the arrangement based on the aforementioned selling price hierarchy. If the arrangement contains more than one software deliverable, the arrangement consideration allocated to the software deliverables as a group is then allocated to each software deliverable using the guidance for recognizing software revenue, as amended.

Use of Estimates

These unaudited consolidated financial statements have been prepared in conformity with GAAP, which requires management to make estimates and assumptions about future events that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. The more significant estimates include valuation of goodwill and intangible assets, useful lives of long-lived assets, allowance for doubtful accounts, inventory valuation, reserves for self-insured workers compensation and health benefits and provision for income taxes.

Goodwill and Intangible Assets

Goodwill represents the excess of the purchase price over the fair market value of net assets of the acquired business at the date of acquisition. The Company tests for impairment annually, in its fiscal fourth quarter, using a two-step process. The first step identifies potential impairment by comparing the fair value of the Company’s reporting units to its carrying value. If the fair value is less than the carrying value, the second step measures the amount of impairment, if any. The impairment loss is the amount by which the carrying amount of goodwill exceeds the implied fair value of that goodwill. The most recent annual test for impairment performed for fiscal 2011 did not identify any instances of impairment and there were no events through August 31, 2011 that warranted a reconsideration of our impairment test results.

Intangible assets are recorded at cost. Intangible assets with finite lives are amortized on a straight-line basis over their estimated useful lives.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents and accounts receivable. At times, cash deposits may exceed the limits insured by the Federal Deposit Insurance Corporation. The Company believes it is not exposed to any significant credit risk or risk of nonperformance of financial institutions.

The Company sells primarily to large companies, extends reasonably short collection terms, performs credit evaluations and does not require collateral. The Company maintains reserves for potential credit losses.

We have one customer, BP plc. (BP), which accounted for 16% and 18% of revenues for the three months ended August 31, 2011 and 2010, respectively. Accounts receivable from this customer were approximately 11% and 15% of total accounts receivable, net as of August 31, 2011 and 2010, respectively. Our relationship with BP is comprised of separate contracts for non-destructive testing and inspection services with multiple affiliated entities within the broad BP organization. We conduct business with various divisions or affiliates of the BP organization through numerous contracts covering many segments of BP’s business including downstream (refinery), midstream (pipelines) and upstream (exploration). These contracts are typically negotiated locally with the specific location, are of varying lengths, have different start and end dates and differ in terms of the scope of work and nature of services provided. Most contracts are based on time and materials.

Equity-based Compensation

The Company measures the cost of employee services received in exchange for an award of equity instruments based upon the grant-date fair value of the award. The Company uses the “straight-line” attribution method for allocating compensation costs and recognizes the fair value of each equity award on a straight-line basis over the vesting period of the related awards.

The Company uses the Black-Scholes option-pricing model to estimate the fair value of the stock option awards as of the grant date. The Black-Scholes model, by its design, is highly complex and dependent upon key data inputs estimated by management. The primary data inputs with the greatest degree of judgment are the expected term of stock option awards and the estimated volatility of the Company’s common stock price. The Black-Scholes model is sensitive to changes in these two variables. Since the Company’s initial public offering (IPO), the expected term of the Company’s stock options is generally determined using the mid-point between the vesting period and the end of the contractual term. Expected stock price volatility is typically based on the daily historical trading data for a period equal to the expected term. Because the Company’s historical trading data only dates back to October 8, 2009, the first trading date after its IPO, the Company has estimated expected volatility using an analysis of the stock price volatility of comparable peer companies. Prior to the Company’s IPO, the exercise price equaled the estimated fair market value of the Company’s common stock, as determined by its board of directors. Since the Company’s IPO, the exercise price of stock option grants is determined using the closing market price of the Company’s common stock on the date of grant.

Recent Accounting Pronouncements

In October 2009, the FASB issued ASU 2009-13, Revenue Recognition (Topic 605): Multiple-Deliverable Revenue Arrangements (a consensus of the FASB Emerging Issues Task Force), which requires companies to allocate the overall consideration in multiple-element arrangements to each deliverable by using a best estimate of the selling price of individual deliverables in the arrangement in the absence of vendor-specific objective evidence or other third-party evidence of the selling price. Effective June 1, 2011, the Company adopted, on a prospective basis, the provisions of these updated accounting standards related to revenue recognition associated with contractual arrangements involving multiple elements. The adoption of this pronouncement did not have a material impact on the Company’s consolidated financial statements.

In April 2010, the FASB issued ASU 2010-17, Revenue Recognition—Milestone Method (Topic 605): Milestone Method of Revenue Recognition (a consensus of the FASB Emerging Issues Task Force). ASU 2010-17 provides guidance on applying the milestone method to milestone payments for achieving specified performance measure when those payments are related to uncertain future events limited to transactions involving research and development. Entities can make an accounting policy election to recognize arrangement consideration received for achieving specified performance measures during the period in which the milestones are achieved, provided certain criteria are met. Effective June 1, 2011, the Company adopted, on a prospective basis, the provisions of these updated accounting standards related to milestones. The adoption of this pronouncement did not have a material impact on the Company’s consolidated financial statements.

In June 2011, the FASB issued ASU 2011-05, Comprehensive Income (Topic 220): Presentation of Comprehensive Income. ASU 2011-05 allows an entity to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. This authoritative guidance eliminates the option to present the components of other comprehensive income as part of the statement of equity. In addition, items that are reclassified from other comprehensive income to net income must be presented on the face of the financial statements. ASU 2011-05 does not change the items that must be reported in other comprehensive income, when an item of other comprehensive income must be reclassified to net income, the Company’s option to present components of other comprehensive income either net of related tax effects or before related tax effects, nor does it affect how earnings per share is calculated or presented. ASU 2011-05 requires retrospective application, and it is effective for fiscal years and interim periods within those years, beginning after December 15, 2011. Early adoption is permitted. The Company does not expect that the adoption of this pronouncement will have a material impact on the Company’s consolidated financial statements.

In September 2011, the FASB issued Accounting Standards Update (ASU) 2011-08, Intangibles-Goodwill and Other (Topic 350): Testing Goodwill for Impairment, to allow entities to use a qualitative approach to test goodwill for impairment. ASU 2011-08 permits an entity to first perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value. If it is concluded that this is the case, it is necessary to perform the currently prescribed two-step goodwill impairment test. Otherwise, the two-step goodwill impairment test is not required. ASU 2011-08 is effective for the Company in fiscal 2013 and earlier adoption is permitted. The Company does not expect that the adoption of this pronouncement will have a material impact on the Company’s consolidated financial statements.

Capitalization

3 Months Ended

Aug. 31, 2011

Capitalization

Capitalization

3. Capitalization

Common Stock

In October 2009, the Company completed its initial public offering of 10,000,000 shares of common stock at a price of $12.50 per share. The Company sold 6,700,000 shares and received net proceeds of approximately $74.0 million from the offering. The Company used approximately $68.0 million of the net proceeds to repay the outstanding principal balance of the term loan ($25.0 million), outstanding balance of the revolver ($41.4 million) and accrued interest thereon ($0.1 million), as well as approximately $1.5 million to pay costs and expenses related to the offering. The remaining proceeds of approximately $6.0 million were used in connection with acquisitions the Company has made and for working capital purposes.

In May 2011, the Company completed a secondary offering of 3,754,061 shares of common stock at a price of $16.00 per share. The Company sold 989,660 shares and 2,764,401 shares were sold by a selling stockholder. The Company received net proceeds of approximately $14.7 million from the offering. The Company used the net proceeds for general corporate purposes including the reduction of outstanding indebtedness, acquisitions, capital expenditures and working capital.

Dividends on common stock will be paid when, and if declared by the board of directors. Each holder of common stock is entitled to vote on all matters and is entitled to one vote for each share held.

Equity Awards

In September 2009, the Company’s board of directors and shareholders adopted and approved the 2009 Long-Term Incentive Plan (the 2009 Plan), which became effective upon the closing of the IPO. Awards may be in the form of stock options, restricted stock units and other forms of stock-based incentives, including stock appreciation rights and deferred stock rights. The term of each incentive and non-qualified stock option is ten years. Vesting generally occurs over a period of four years, the expense for which is recorded on a straight-line basis over the requisite service period. The 2009 Plan allows for the grant of awards of up to approximately 2,286,000 shares of common stock, of which 1,707,000 shares were available for future grants as of August 31, 2011. Prior to the Company’s IPO in October 2009, the Company had two stock option plans: (i) the 1995 Incentive Stock Option and Restricted Stock Purchase Plan (the 1995 Plan), and (ii) the 2007 Stock Option Plan (the 2007 Plan). No additional awards may be granted from these two plans. As of August 31, 2011, there were approximately 2,859,000 stock options outstanding and approximately 451,000 unvested restricted stock units outstanding under the 2009 Plan, the 2007 Plan, and the 1995 Plan.

The fair value of the Company’s stock option awards for the three months ended August 31, 2010 was estimated at the date of grant using the Black-Scholes option-pricing model with the range of assumptions below. No stock options were granted during the three months ended August 31, 2011.

	Three months ended August 31, 2010

Dividend yield	0.0	%
Expected volatility	44	%
Risk-free interest rate	2.6	%
Expected term (years)	6.3

The Company recognized stock-based compensation expense related to stock option awards of approximately $0.8 million and $0.7 million for the three months ended August 31, 2011 and 2010, respectively. As of August 31, 2011, there was approximately $6.2 million of unrecognized compensation costs, net of estimated forfeitures, related to stock option awards, which are expected to be recognized over a remaining weighted average period of 2.0 years. Cash proceeds from and the aggregate intrinsic value of stock options exercised during the three months ended August 31, 2011 were as follows:

	Three months ended August 31, 2011

Cash proceeds from options exercised	$	55
Aggregate intrinsic value of options exercised	$	34

There were no stock option exercises during the three months ended August 31, 2010.

The Company also recognized approximately $0.2 million in stock-based compensation expense related to restricted stock unit awards during the three months ended August 31, 2011. Stock-based compensation expense related to restricted stock unit awards during the three months ended August 31, 2010 was de minimus. As of August 31, 2011, there was approximately $7.1 million of unrecognized compensation costs, net of estimated forfeitures, related to restricted stock unit awards, which are expected to be recognized over a remaining weighted average period of 3.8 years.

During the first quarter of fiscal 2012, approximately 52,000 restricted stock units vested, the fair value of which was $0.5 million. Upon vesting, restricted stock units are generally net share-settled to cover the required withholding tax and the remaining amount is converted into an equivalent number of shares of common stock. The restricted stock units that vested in the first quarter of fiscal 2012 were net-share settled such that the Company withheld shares with value equivalent to the employees’ minimum statutory obligation for the applicable income and other employment taxes, and remitted the cash to the appropriate taxing authorities. The Company withheld approximately 16,000 shares based on the value of the restricted stock units on their vesting date as determined by the Company’s closing stock price. Total payments for the employees’ tax obligations to the taxing authorities were $0.3 million and are reflected as a financing activity within the consolidated statements of cash flows. These net-share settlements had the effect of share repurchases by the Company as they reduced and retired the number of shares that would have otherwise been issued as a result of the vesting and did not represent an expense to the Company.

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 4
-Section 08
-Paragraph d

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 1
-Section B
-Paragraph 7, 11A
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 3, 4, 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 15
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 11: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
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-Paragraph 1
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Reference 23: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770

+ Details

Acquisitions

3 Months Ended

Aug. 31, 2011

Acquisitions

Acquisitions

5. Acquisitions

The Company made three acquisitions during the three months ended August 31, 2011. These acquisitions were asset protection companies specializing in advanced ultrasonic inspection, NDT services and inspection, and ultrasonic testing (UT) products and systems. These companies were acquired to complement our service and product offerings within our Services, Products and Systems, and International segments. One acquisition was an asset purchase that met the definition of “acquisitions of businesses” under the provision FASB Accounting Standards Codification (ASC) 805-10-20 and has been integrated into our Services segment. In the remaining acquisitions, we acquired 100% of the common stock of the acquirees, which have been integrated into our International segment. In addition to the cash and debt consideration, the Company also accrued a liability of approximately $1.1 million as of August 31, 2011, which represents the estimated fair value of contingent consideration expected to be payable in the event that certain of the acquired companies achieve specific performance metrics over the next four years of operations. The total potential contingent consideration ranges from zero to $1.6 million for these acquisitions.

Assets and liabilities of the acquired businesses were included in the consolidated balance sheets as of August 31, 2011 based on their estimated fair value on the date of acquisition as determined in a purchase price allocation, using available information and making assumptions management believes are reasonable. The Company is still in the process of completing its valuations of the intangible assets of the acquisitions in our International segment. We believe we will have finalized these valuations and purchase price allocations prior to the end of our second fiscal quarter ending November 30, 2011. The Company’s preliminary allocation of purchase price for these acquisitions is included in the table below. Results of operations for the period from acquisition date are reported in each respective operating segment’s statement of operations. The following table summarizes the estimated fair value of the assets acquired and liabilities assumed at the date of acquisition:

	Three months ended August 31,
	2011		2010
Number of entities	3		2

Cash paid	$	5,628	$	5,301
Subordinated notes issued	—		1,637
Debt and other liabilities assumed	1,386		98
Contingent consideration	1,115		—

Purchase price	$	8,129	$	7,036

Current net assets acquired	7		59
Property, plant and equipment	1,022		1,067
Deferred tax asset	88		6
Intangibles	2,110		2,655
Goodwill	4,902		3,366
Less: noncontrolling interest	—		(117		)
Net assets acquired	$	8,129	$	7,036

The amortization period of intangible assets acquired ranges from one to fifteen years. The Company recorded approximately $4.9 million of goodwill in connection with its fiscal 2012 acquisitions, reflecting the strategic fit and revenue and earnings growth potential of these businesses. Substantially all of the goodwill recognized is expected to be deductible for tax purposes.

Revenues and loss from operations included in the Consolidated Statement of Operations for the three months ended August 31, 2011 from these acquisitions for the period subsequent to the closing of each transaction was approximately $0.4 million and $0.1 million, respectively.

The unaudited pro forma information for the periods set forth below gives effect to the fiscal 2012 acquisitions as if they had occurred at the beginning of each period presented. The pro forma information is presented for informational purposes only and is not necessarily indicative of the results of operations that actually would have been achieved had the acquisitions been consummated as of that time (unaudited, in thousands):

	Three months ended August 31,
	2011		2010

Revenues	$	93,394	$	70,595

Income from operations	$	5,520	$	2,518

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 88-16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51, 52
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Appendix F
-Paragraph F4
-Subparagraph e

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 67-73
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Accounting Standards Codification
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+ Details

Segment Disclosure

3 Months Ended

Aug. 31, 2011

Segment Disclosure

Segment Disclosure

12. Segment Disclosure

The Company’s three segments are:

Services. This segment provides asset protection solutions primarily in North America with the largest concentration in the United States, consisting primarily of non-destructive testing and inspection services that are used to evaluate the structural integrity and reliability of critical energy, industrial and public infrastructure.

Products and Systems. This segment designs, manufactures, sells, installs and services the Company’s asset protection products and systems, including equipment and instrumentation, predominantly in the United States.

International. This segment offers services, products and systems similar to those of our other segments to global markets, principally in Europe, the Middle East, Africa, Asia and South America, but not to customers in China and South Korea, which are served by our Products and Systems segment.

Allocations for general corporate services, including accounting, audit, and contract management, that are provided to the segments are reported within Corporate and eliminations. Sales to the International segment from the Products and Systems segment and subsequent sales by the International segment of the same items are recorded and reflected in the operating performance of both segments. Additionally, engineering charges and royalty fees charged to the Services and International segments by the Products and Systems segment are reflected in the operating performance of each segment. All such intersegment transactions are eliminated in the Company’s consolidated financial reporting.

Segment income from operations is determined based on internal performance measures used by the Chief Executive Officer, who is the chief operating decision maker, to assess the performance of each business in a given period and to make decisions as to resource allocations. In connection with that assessment, the Chief Executive Officer may exclude matters such as charges for stock-based compensation and certain other acquisition-related charges and balances, technology and product development costs, certain gains and losses from dispositions, and litigation settlements or other charges. Certain general and administrative costs such as human resources, information technology and training are allocated to the segments. Segment income from operations also excludes interest and other financial charges and income taxes. Corporate and other assets are comprised principally of cash, deposits, property, plant and equipment, domestic deferred taxes, deferred charges and other assets. Corporate loss from operations consists of depreciation on the corporate office facilities and equipment, administrative charges related to corporate personnel and other charges that cannot be readily identified for allocation to a particular segment.

Selected consolidated financial information by segment for the periods shown was as follows:

	Three months ended August 31,
	2011			2010

Revenues (1)
Services	$	75,689		$	55,282
Products and Systems	7,513			5,310
International	9,773			9,040
Corporate and eliminations	(1,528		)	(1,222		)
	$	91,447		$	68,410

(1) Revenues by operating segment include intercompany transactions, which are eliminated in corporate and eliminations. The Services segment had sales to other operating segments of $0.1 million and $0.3 million for the three months ended August 31, 2011 and 2010, respectively. The Products and Systems segment had sales to other operating segments of $1.3 million and $0.8 million for the three months ended August 31, 2011 and 2010, respectively. The International segment had sales to other operating segments of $0.1 million and $0.2 million for the three months ended August 31, 2011 and 2010, respectively.

	Three months ended August 31,
	2011			2010

Gross profit
Services	$	20,308		$	15,001
Products and Systems	3,751			2,569
International	3,431			3,271
Corporate and eliminations	(70		)	(63		)
	$	27,420		$	20,778

	Three months ended August 31,
	2011			2010

Income from operations
Services	$	7,160		$	3,848
Products and Systems	1,011			791
International	736			1,028
Corporate and eliminations	(2,936		)	(2,351		)
	$	5,971		$	3,316

Operating income by operating segment includes intercompany transactions, which are eliminated in Corporate and eliminations.

	Three months ended August 31,
	2011		2010

Depreciation and amortization
Services	$	4,103	$	3,584
Products and Systems	471		206
International	360		320
Corporate and eliminations	45		32
	$	4,979	$	4,142

	As of August 31, 2011		As of May 31, 2011

Intangible assets, net
Services	$	15,151	$	15,900
Products and Systems	10,061		10,250
International	2,596		771
Corporate and eliminations	355		383
	$	28,163	$	27,304

	As of August 31, 2011		As of May 31, 2011

Goodwill
Services	$	53,699	$	51,745
Products and Systems	10,557		10,557
International	4,714		1,844
Corporate and eliminations	—		—
	$	68,970	$	64,146

	As of August 31, 2011		As of May 31, 2011

Long-lived assets
Services	$	114,119	$	109,978
Products and Systems	21,229		23,235
International	12,049		6,504
Corporate and eliminations	2,486		901
	$	149,883	$	140,618

	As of August 31, 2011			As of May 31, 2011

Total assets
Services	$	184,277		$	188,693
Products and Systems	34,996			36,450
International	31,658			26,431
Corporate and eliminations	(2,414		)	(2,937		)
	$	248,517		$	248,637

Revenues by geographic area for the three months ended August 31, 2011 and 2010, respectively, were as follows:

	Three months ended August 31,
	2011		2010

Revenues
United States	$	71,476	$	54,767
Other Americas	9,798		6,440
Europe	5,600		4,853
Asia-Pacific	4,573		2,350
	$	91,447	$	68,410

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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+ Details

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Aug. 31, 2011	Oct. 03, 2011
Document and Entity Information
Entity Registrant Name	Mistras Group, Inc.
Entity Central Index Key	0001436126
Document Type	10-Q
Document Period End Date	Aug. 31, 2011
Amendment Flag	false
Current Fiscal Year End Date	--05-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		27,712,542
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1

Consolidated Balance Sheets (Parenthetical) - $ / shares	Aug. 31, 2011	May 31, 2011
Consolidated Balance Sheets
Preferred stock, shares authorized	10,000,000	10,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	27,712,038	27,667,122
Common stock, shares outstanding	27,712,038	27,667,122