CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 68,596	$ 142,795	$ 147,429	$ 184,841
Other comprehensive income (loss):
Foreign currency translation adjustment	(3,436)	1,191	(5,431)	5,554
Change in fair value of interest rate swap agreements, net of tax	(3,778)	2,613	(3,561)	3,121
Other comprehensive income (loss), net of tax	(7,214)	3,804	(8,992)	8,675
Comprehensive income	$ 61,382	$ 146,599	$ 138,437	$ 193,516