Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 884,981	$ 842,586	$ 480,708
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(21,572)	19,276	(10,252)
Change in fair value of interest rate lock agreements	(27,659)	0	31,136
Amortization of interest rate lock agreements	(1,179)	(933)	1,076
Other	(5,085)	1,029	(115)
Other comprehensive (loss) income, net of tax (benefit) expense of ($9,635), $690 and $19,118, respectively	(55,495)	19,372	21,845
Comprehensive income	$ 829,486	$ 861,958	$ 502,553