Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 24,557	$ 26,177	$ 49,107	$ 53,498
Income taxes	(43,676)	(62,127)	(68,891)	(90,302)
Net income	284,857	246,443	584,862	497,255
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Unrealized Income (Loss) on Interest Rate Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income taxes	(115)	(116)	(231)	(295)
Net income	359	358	717	653
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	$ 948	$ 948