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Revenue Recognition (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended 36 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2017
Feb. 29, 2016
May 31, 2016
May 31, 2016
Revenue Recognition            
Recognized favorable cumulative catch-up adjustments $ 2.9 $ 2.5 $ 6.7 $ 6.0    
Revenue from support services 203.4 183.4 586.8 545.5    
Gross profit on support services 69.0 $ 59.3 196.7 $ 172.3    
KC10 logistics support services            
Revenue Recognition            
Revenue from support services         $ 148.1  
Gross profit on support services         16.0  
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 $ 16.9   $ 16.9   $ 29.8 $ 29.8