CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 79,195	$ 68,596	$ 147,172	$ 147,429
Other comprehensive income (loss):
Foreign currency translation adjustment	11,215	(3,436)	5,907	(5,431)
Change in fair value of interest rate swap agreements, net of tax	3,735	(3,778)	(1,229)	(3,561)
Other comprehensive loss, net of tax	14,950	(7,214)	4,678	(8,992)
Comprehensive income	$ 94,145	$ 61,382	$ 151,850	$ 138,437