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Inventory (Details) (USD $)
In Millions, unless otherwise specified
Aug. 31, 2014
item
May 31, 2014
item
Inventory    
Raw materials and parts $ 100.5 $ 114.1
Work-in-process 51.9 57.5
Aircraft and engine parts, components and finished goods 329.8 297.3
Aircraft held for sale and related support parts 49.8 26.4
Total inventories $ 532.0 $ 495.3
Inventory    
Number of aircrafts held for sale 15 9
Fixed-wing aircraft
   
Inventory    
Number of aircrafts held for sale 7 5
Rotary-wing aircraft
   
Inventory    
Number of aircrafts held for sale 8 4