Unconsolidated Subsidiaries	6 Months Ended
Unconsolidated Subsidiaries	Nov. 30, 2011
Unconsolidated Subsidiaries [Abstract]
Unconsolidated Subsidiaries	11. UNCONSOLIDATED SUBSIDIARIES Our earnings from unconsolidated affiliates consists entirely of our joint venture (50% ownership) formed in May 2008, to perform non-destructive testing and inspection services in Alaska. The joint venture is an integral part of our operations in Alaska. Our investment in the net assets of the joint venture, accounted for using the equity method of accounting, was $2.2 million at November 30, 2011 and $1.4 million at May 31, 2011. Revenues from the joint venture not reflected in our consolidated revenues were $7.6 million and $5.5 million for the six months ended November 30, 2011 and 2010, respectively.

The entire disclosure for equity investment, or group of investments, for which combined disclosure is appropriate, including: (a) the name of each investee and percentage of ownership of common stock, (b) accounting policies for investments in common stock, (c) difference between the amount at which the investment is carried and the amount of underlying equity in net assets and the accounting treatment of the difference, (d) the total fair value of each identified investment for which a market value is available, (e) summarized information as to assets, liabilities, and results of operations of the investees (for investments in unconsolidated subsidiaries, common stock of joint ventures, or other investments using the equity method), and (f) material effects of possible conversions, exercises, or contingent issuances of the investee. Other disclosures include (a) the names of any investee in which the investor owns 20 percent or more of the voting stock and investment is not accounted for using the equity method, and the reasons why not, and (b) the names of any investee in which the investor owns less than 20 percent of the voting stock and the investment is accounted for using the equity method, and the reasons why it is.

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