CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 42,420	$ 30,452	$ 79,083	$ 65,084
Other comprehensive (loss) income:
Foreign currency translation adjustment	(6,424)	(3,337)	(10,126)	(7,747)
Change in fair value of interest rate swap agreements, net of tax	10,045	3,832	12,899	798
Other comprehensive (loss) income, net of tax	3,621	495	2,773	(6,949)
Comprehensive income	$ 46,041	$ 30,947	$ 81,856	$ 58,135