SUPPLEMENTARY DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Quarterly Financial Information Disclosure [Abstract]
Net revenue	$ 286,641	$ 284,911	$ 307,276	$ 282,905	$ 269,778	$ 250,404	$ 250,811	$ 245,868	$ 1,161,733	$ 1,016,861	$ 865,268
Gross profit	132,937	132,830	140,231	131,606	120,540	114,476	96,900	111,656	537,604	443,572	395,708
Income from operations	100,885	102,137	91,657	99,618	88,114	84,870	66,080	87,063	394,297	326,127	289,761
Net income	$ 70,895	$ 88,300	$ 77,796	$ 85,703	$ 70,085	$ 102,739	$ (51,459)	$ 74,925	$ 322,694	$ 196,290	$ 257,506
Net income per share of common stock:
Basic (in dollars per share)	$ 1.01	$ 1.25	$ 1.09	$ 1.16	$ 0.95	$ 1.34	$ (0.66)	$ 0.93	$ 4.52	$ 2.54	$ 3.16
Diluted (in dollars per share)	$ 1.01	$ 1.25	$ 1.09	$ 1.16	$ 0.94	$ 1.32	$ (0.66)	$ 0.92	$ 4.51	$ 2.51	$ 3.09