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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2017
May 31, 2016
May 31, 2015
Revenue Recognition      
Recognized net favorable cumulative catch-up adjustments $ 8.5 $ 3.7 $ 2.5
KC10 Supply Program      
Revenue Recognition      
Unbilled accounts receivable related to KC10 program 14.5 29.8  
KC10 logistics support services      
Revenue Recognition      
Sales for KC10 logistics support services 110.6 148.1 111.4
Gross profit recognized for KC10 logistics support services $ 3.7 $ 12.0 $ 4.5
Minimum      
Principles of Consolidation      
Percentage of owned aircraft 20.00%    
Maximum      
Principles of Consolidation      
Percentage of owned aircraft 50.00%