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Inventory (Details) (USD $) In Thousands, unless otherwise specified	Feb. 29, 2012	May 31, 2011
Inventory
Raw materials and parts	$ 102,195	$ 61,314
Work-in-process	70,517	51,725
Purchased aircraft, parts, engines and components held for sale	304,755	250,360
Total inventories	$ 477,467	$ 363,399

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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