Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2020	Aug. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 24,550	$ 27,321
Income taxes	(25,215)	(28,175)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Unrealized Income (Loss) on Interest Rate Hedges | Interest Rate Locks
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	474	474
Income taxes	(116)	(179)
Net income	$ 358	$ 295