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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
May. 31, 2013
Nov. 30, 2012
May. 31, 2015
May. 31, 2014
Revenue Recognition        
Cost in excess of amount billed     $ 14.4 $ 15.1
KC10 Supply Agreement        
Revenue Recognition        
Unbilled accounts receivable related to KC10 supply agreement     21.1 19.7
Cost in excess of amount billed     $ 7.5 $ 9.9
Margin forecast on flight hour portion of supply contract (as a percent)     0.00% 0.00%
Margin forecast on remaining life of flight hour portion of supply contract (as a percent)     0.00%  
Pre-tax charge $ 29.8      
Decrease in flight hours flow due to lower operations tempo (as a percent)   28.00%    
Revenue on flight hour portion of contract     $ 46.5 $ 42.4
Minimum        
Principles of Consolidation        
Percentage of owned aircraft     20.00%  
Maximum        
Principles of Consolidation        
Percentage of owned aircraft     50.00%  
Wholly-Owned        
Principles of Consolidation        
Percentage of owned aircraft     100.00%