Derivatives and Hedging (Details) - Not Designated as Hedging Instrument - Foreign Exchange Contract - USD ($)	9 Months Ended
	Feb. 28, 2019	Feb. 28, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	$ 30,000,000	$ 27,500,000.0
Unrealized gain (loss)	$ (300,000)	$ (300,000)