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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
May 31, 2013
May 31, 2014
May 31, 2013
May 31, 2012
Revenue Recognition        
Unbilled accounts receivable related to KC10 supply agreement $ 28.4 $ 19.7 $ 28.4  
Cost in excess of amount billed 9.9 15.1 9.9  
Prior margin forecast on flight hour portion of supply contract (as a percent)       8.00%
Margin forecast on flight hour portion of supply contract (as a percent)   0.00% 2.00% 2.00%
Margin forecast on remaining life of flight hour portion of supply contract (as a percent)   0.00%    
Pre-tax charge 29.8     9.5
Decrease in flight hours flow due to lower operations tempo (as a percent)     28.00%  
Revenue on flight hour portion of contract   $ 42.4    
Minimum
       
Principles of Consolidation        
Common stock ownership for equity method accounting (as a percent)   20.00%    
Maximum
       
Principles of Consolidation        
Common stock ownership for equity method accounting (as a percent)   50.00%