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Summary of Significant Accounting Policies (Details 5) (USD $) In Thousands, unless otherwise specified	May 31, 2012	May 31, 2011
Inventories
Raw materials and parts	$ 101,257	$ 61,314
Work-in-process	64,682	51,725
Aircraft and engine parts, components and finished goods	295,227	250,360
Total inventories	461,166	363,399
Accounts receivable \| Customer \| U.S. Department of Defense
Financial Instruments and Concentrations of Market or Credit Risk
Accounts receivable due	$ 50,598	$ 70,652

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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