Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2019	Aug. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 27,321	$ 24,304
Income taxes	(28,175)	(28,873)
Net income	250,812	212,547
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Unrealized Loss on Interest Rate Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income taxes	(179)	(179)
Net income	295	295
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Unrealized Loss on Interest Rate Hedges | Interest Rate Locks
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 474	$ 474