Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2020	Aug. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 300,005	$ 250,812
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	26,946	6,724
Change in fair value of interest rate lock agreements, net of tax expense (benefit) of $3,672 and $(9,844), respectively	10,842	(29,903)
Amortization of interest rate lock agreements, net of tax benefit of $116 and $179, respectively	(358)	(295)
Other comprehensive income (loss), net of tax expense (benefit) of $3,788 and $(9,665), respectively	37,430	(23,474)
Comprehensive income	$ 337,435	$ 227,338