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Inventory (Details)
$ in Millions
Feb. 28, 2017
USD ($)
aircraft
May 31, 2016
USD ($)
Inventory    
Raw materials and parts $ 41.6 $ 46.3
Work-in-process 26.0 23.4
Aircraft and engine parts, components and finished goods 382.5 366.6
Aircraft held for sale and related support parts 15.5 15.7
Total inventories $ 465.6 $ 452.0
Number of aircrafts held for sale | aircraft 8  
Fixed-wing aircraft    
Inventory    
Number of aircrafts held for sale | aircraft 5  
Rotary-wing aircraft    
Inventory    
Number of aircrafts held for sale | aircraft 3