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Inventory (Details)
$ in Millions
6 Months Ended 12 Months Ended
Nov. 30, 2015
USD ($)
aircraft
May. 31, 2015
USD ($)
aircraft
Inventory    
Raw materials and parts $ 41.9 $ 43.1
Work-in-process 18.2 18.1
Aircraft and engine parts, components and finished goods 365.3 337.0
Aircraft held for sale and related support parts 36.7 57.8
Total inventories $ 462.1 $ 456.0
Inventory    
Number of aircrafts held for sale | aircraft 9 11
Proceeds from sale-leaseback advance $ 19.2  
Fixed-wing aircraft    
Inventory    
Number of aircrafts held for sale | aircraft 5 5
Rotary-wing aircraft    
Inventory    
Number of aircrafts held for sale | aircraft 4 6
S-92 rotary-wing aircraft    
Inventory    
Number of aircrafts involved in sale leaseback transaction | aircraft   2
Proceeds from sale-leaseback advance   $ 40.3
Number of aircrafts sold | aircraft 1