Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2016	Aug. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (24,874)	$ (8,471)
Other comprehensive income (loss) before reclassifications	(11,923)	(12,021)
Amounts reclassified from accumulated other comprehensive income (loss)	385	488
Other comprehensive loss	(11,538)	(11,533)
Ending Balance	(36,412)	(20,004)
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(2,474)	2,987
Other comprehensive income (loss) before reclassifications	115	(12,013)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Other comprehensive loss	115	(12,013)
Ending Balance	(2,359)	(9,026)
Unrealized Loss on Derivatives
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(20,830)	(10,626)
Other comprehensive income (loss) before reclassifications	(12,037)	0
Amounts reclassified from accumulated other comprehensive income (loss)	385	488
Other comprehensive loss	(11,652)	488
Ending Balance	(32,482)	(10,138)
Other
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(1,570)	(832)
Other comprehensive income (loss) before reclassifications	(1)	(8)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Other comprehensive loss	(1)	(8)
Ending Balance	$ (1,571)	$ (840)