CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 78,833	$ 42,046
Other comprehensive income (loss):
Foreign currency translation adjustment	(1,995)	4,363
Change in fair value of interest rate swap agreements, net of tax	217	508
Other comprehensive income (loss), net of tax	(1,778)	4,871
Comprehensive income	$ 77,055	$ 46,917