Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2018	Aug. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 24,304	$ 30,317
Income taxes	(28,873)	(57,971)
Net income	212,547	161,108
Reclassifications out of Accumulated Other Comprehensive Income (Loss) | Unrealized Income on Interest Rate Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income taxes	(179)	(106)
Net income	295	172
Reclassifications out of Accumulated Other Comprehensive Income (Loss) | Unrealized Income on Interest Rate Hedges | Interest Rate Locks
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 474	$ 278