Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 284,857	$ 246,120	$ 584,862	$ 496,932
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	2,960	1,413	29,906	8,137
Change in fair value of interest rate lock agreements, net of tax expense (benefit) of $5,400, $7,346, $9,072 and $(2,498), respectively	15,942	22,761	26,784	(7,142)
Amortization of interest rate lock agreements, net of tax benefit of $115, $116, $231 and $295, respectively	(359)	(358)	(717)	(653)
Other comprehensive income, net of tax expense (benefit) of $5,515, $7,462, $9,303 and $(2,203), respectively	18,543	23,816	55,973	342
Comprehensive income	$ 303,400	$ 269,936	$ 640,835	$ 497,274