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Revenue Recognition (Details) - USD ($)
$ in Millions
36 Months Ended
May 31, 2016
Aug. 31, 2016
May 31, 2015
KC10 logistics support services      
Revenue Recognition      
Average annual revenue recognized for KC10 logistics support services $ 115.9    
Average Annual Gross Profit Recognized On Support Services $ 7.4    
KC10 Supply Program      
Revenue Recognition      
Unbilled accounts receivable related to KC10 program   $ 26.9 $ 29.8