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Inventory (Details)
$ in Millions
Feb. 29, 2016
USD ($)
aircraft
May. 31, 2015
USD ($)
aircraft
Inventory    
Raw materials and parts $ 37.9 $ 43.1
Work-in-process 22.6 18.1
Aircraft and engine parts, components and finished goods 380.1 337.0
Aircraft held for sale and related support parts 17.5 57.8
Total inventories $ 458.1 $ 456.0
Inventory    
Number of aircrafts held for sale | aircraft 8 11
Fixed-wing aircraft    
Inventory    
Number of aircrafts held for sale | aircraft 5 5
Rotary-wing aircraft    
Inventory    
Number of aircrafts held for sale | aircraft 3 6