CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 40,357	$ 34,116	$ 119,440	$ 99,200
Other comprehensive income (loss):
Foreign currency translation adjustment	1,565	(3,270)	(8,561)	(11,017)
Change in fair value of interest rate swap agreements, net of tax	2,045	(3,581)	14,944	(2,783)
Other comprehensive income (loss), net of tax	3,610	(6,851)	6,383	(13,800)
Comprehensive income	$ 43,967	$ 27,265	$ 125,823	$ 85,400