Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 26,770	$ 25,901	$ 75,954	$ 85,347
Income taxes	(50,632)	121,282	(157,035)	(5,325)
Net income	200,923	295,789	656,464	594,634
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)	(180)	(538)	(392)
Net income	295	294	884	638
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	$ 474	$ 1,422	$ 1,030