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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]    
Net income $ 42,046 $ 36,663
Other comprehensive income (loss):    
Foreign currency translation adjustment 4,363 (3,702)
Change in fair value of interest rate swap agreements, net of tax 508 2,854
Other comprehensive income (loss), net of tax 4,871 (848)
Comprehensive income $ 46,917 $ 35,815