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Inventory (Details) (USD $)
In Millions, unless otherwise specified
Aug. 31, 2012
May 31, 2012
Inventory    
Raw materials and parts $ 97.0 $ 101.3
Work-in-process 76.7 64.7
Purchased aircraft, parts, engines and components held for sale 292.3 295.2
Total inventories $ 466.0 $ 461.2