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Derivatives and Hedging (Details) - Not Designated as Hedging Instrument - Foreign Exchange Contract - USD ($)
$ in Millions
6 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative notional amount $ 30.5 $ 32.3
Unrealized gain (loss) $ (0.1) $ 0.9