DEBT (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2012
Long-term debt disclosure
Principal	$ 645,000	$ 370,000
Unamortized Discount	(36,943)	(47,890)
Debt Issuance Costs	(7,372)	(8,241)
Total debt	600,685	313,869
Interest payments on notes	17,691	10,638	$ 10,638
Convertible notes due 2019
Long-term debt disclosure
Principal	370,000	370,000
Unamortized Discount	(36,943)	(47,890)
Debt Issuance Costs	(3,934)	(5,180)
Total debt	329,123	316,930
Aggregate principal amount of convertible senior notes issued				$ 370,000
Interest rate on convertible senior notes (as a percent)				2.875%
Interest expense recognized	22,800	22,100	$ 21,400
Interest payments on notes	10,600	10,600
Revolving credit facility
Long-term debt disclosure
Principal	275,000
Debt Issuance Costs	(3,438)	(3,061)
Total debt	271,562	(3,061)
Maximum availability under the revolving credit facility	650,000
Outstanding amount under credit facility	275,000	$ 0
Available under the revolving credit facility	$ 375,000
Revolving credit facility | LIBOR
Long-term debt disclosure
Revolving credit facility, basis spread on interest rate (as a percent)	2.25%
Effective interest rate (as percent)	2.89%
Revolving credit facility | Minimum | LIBOR
Long-term debt disclosure
Revolving credit facility, basis spread on interest rate (as a percent)	1.25%
Revolving credit facility | Maximum | LIBOR
Long-term debt disclosure
Revolving credit facility, basis spread on interest rate (as a percent)	3.00%