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Summary of Significant Accounting Policies - Inventory (Details)
$ in Millions
3 Months Ended 12 Months Ended
May 31, 2015
USD ($)
aircraft
May 31, 2015
USD ($)
aircraft
May 31, 2016
USD ($)
aircraft
Inventories      
Raw materials and parts $ 43.1 $ 43.1 $ 44.0
Work-in-process 18.1 18.1 20.2
Aircraft and engine parts, components and finished goods 337.0 337.0 365.5
Aircraft held for sale and related support parts 57.8 57.8 15.7
Total inventories $ 456.0 $ 456.0 $ 445.4
Number of Aircrafts Held for Sale | aircraft 11 11 8
Inventory impairment charge   $ 8.9  
Proceeds from sale-leaseback advance   $ 40.3  
Fixed-wing aircraft      
Inventories      
Number of Aircrafts Held for Sale | aircraft 5 5 5
Rotary-wing aircraft      
Inventories      
Number of Aircrafts Held for Sale | aircraft 6 6 3
Number of aircrafts under sale leaseback transaction | aircraft 2 2  
Sale leaseback transaction loss $ 1.1