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SUPPLEMENTARY DATA (UNAUDITED) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Net revenue $ 228,616 $ 218,359 $ 213,536 $ 204,757 $ 185,676 $ 167,433 $ 161,871 $ 151,415 $ 865,268 $ 666,395 $ 595,947
Gross profit 103,179 99,086 95,139 98,304 89,757 82,493 79,041 73,504 395,708 324,795 262,187
Income from operations 71,650 73,409 69,800 74,902 65,646 60,138 56,436 59,835 289,761 242,055 146,878
Net income and comprehensive income $ 60,678 $ 64,432 $ 60,608 $ 71,788 $ 57,706 $ 52,699 $ 49,452 $ 53,759 $ 257,506 $ 213,616 $ 129,663
Net income per share of common stock:                      
Basic (in dollars per share) $ 0.76 $ 0.79 $ 0.74 $ 0.88 $ 0.70 $ 0.63 $ 0.58 $ 0.62 $ 3.16 $ 2.53 $ 1.47
Diluted (in dollars per share) $ 0.74 $ 0.77 $ 0.72 $ 0.86 $ 0.69 $ 0.62 $ 0.57 $ 0.61 $ 3.09 $ 2.49 $ 1.45