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Inventory (Details)
$ in Millions
12 Months Ended
May. 31, 2015
USD ($)
aircraft
Aug. 31, 2015
USD ($)
aircraft
Inventory    
Raw materials and parts $ 43.1 $ 40.7
Work-in-process 18.1 18.9
Aircraft and engine parts, components and finished goods 337.0 363.1
Aircraft held for sale and related support parts 57.8 55.9
Total inventories $ 456.0 $ 478.6
Inventory    
Number of aircrafts held for sale | aircraft 11 10
Fixed-wing aircraft    
Inventory    
Number of aircrafts held for sale | aircraft 5 5
Rotary-wing aircraft    
Inventory    
Number of aircrafts held for sale | aircraft 6 5
S-92 rotary-wing aircraft    
Inventory    
Number of Aircrafts Involved in Sale Leaseback Transaction | aircraft 2  
Proceeds from sale-leaseback advance $ 40.3