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Inventory (Details) (USD $) In Millions, unless otherwise specified	Feb. 28, 2013	May 31, 2012
Inventory
Raw materials and parts	$ 96.2	$ 101.3
Work-in-process	85.7	64.7
Purchased aircraft, parts, engines and components held for sale	306.4	295.2
Total inventories	$ 488.3	$ 461.2

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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