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Derivatives and Hedging (Details) - Not Designated as Hedging Instrument - Foreign Exchange Contract - USD ($)
$ in Millions
9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative notional amount $ 31.7 $ 9.1
Unrealized gain (loss) $ 0.2 $ (1.1)