Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	Feb. 29, 2020	Feb. 28, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 234,520	$ 246,120	$ 250,812	$ 203,334	$ 243,013	$ 212,515	$ 731,452	$ 658,862
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(4,039)			5,025			4,098	(8,617)
Change in fair value of interest rate lock agreements	(53,582)			(8,183)			(60,724)	(6,430)
Amortization of interest rate lock agreements	(358)			(295)			(1,011)	(884)
Other comprehensive loss	(57,979)	$ 23,816	$ (23,474)	(3,453)	$ (5,996)	$ (6,482)	(57,637)	(15,931)
Comprehensive income	$ 176,541			$ 199,881			$ 673,815	$ 642,931