CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 64,499	$ 40,357	$ 249,340	$ 119,440
Other comprehensive income:
Foreign currency translation adjustment	5,779	1,565	11,333	(8,561)
Change in fair value of interest rate swap agreements, net of tax	3,344	2,045	6,465	14,944
Other comprehensive income, net of tax	9,123	3,610	17,798	6,383
Comprehensive income	$ 73,622	$ 43,967	$ 267,138	$ 125,823