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Summary of Significant Accounting Policies (Details 4) (USD $) In Millions, unless otherwise specified	May 31, 2014	May 31, 2013
Inventories
Raw materials and parts	$ 114.1	$ 83.9
Work-in-process	57.5	84.0
Aircraft and engine parts, components and finished goods	323.7	285.8
Total inventories	495.3	453.7
Accounts receivable \| Customer \| U.S. Department of Defense
Financial Instruments and Concentrations of Market or Credit Risk
Accounts receivable due	50.5	49.3
Accounts receivable \| Customer \| Large defense contractor
Financial Instruments and Concentrations of Market or Credit Risk
Accounts receivable due	$ 48.7	$ 56.0

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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