CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 68,145	$ 64,499	$ 215,574	$ 249,340
Other comprehensive income (loss):
Foreign currency translation adjustment	3,059	5,779	(2,372)	11,333
Change in fair value of interest rate swap agreements, net of tax	(2,075)	3,344	(5,636)	6,465
Other comprehensive income (loss), net of tax	984	9,123	(8,008)	17,798
Comprehensive income	$ 69,129	$ 73,622	$ 207,566	$ 267,138