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Inventory (Details) (USD $)
In Millions, unless otherwise specified
Aug. 31, 2013
May 31, 2013
Inventory    
Raw materials and parts $ 94.0 $ 83.9
Work-in-process 75.0 84.0
Purchased aircraft, parts, engines and components held for sale 304.3 285.8
Total inventories $ 473.3 $ 453.7