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Inventory (Details) (USD $)
In Thousands
Aug. 31, 2011
May 31, 2011
Inventory    
Raw materials and parts $ 63,053 $ 61,314
Work-in-process 61,913 51,725
Purchased aircraft, parts, engines and components held for sale 277,774 250,360
Total inventories $ 402,740 $ 363,399