DEBT (Details) (USD $)	12 Months Ended						0 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2014 Convertible notes due 2019, net	Jun. 30, 2013 Convertible notes due 2019, net	Jun. 30, 2012 Convertible notes due 2019, net	Jan. 29, 2014 Revolving credit facility	Dec. 31, 2013 Revolving credit facility	Jun. 30, 2014 Revolving credit facility	Jun. 30, 2014 Revolving credit facility Minimum	Jun. 30, 2014 Revolving credit facility Maximum
Long-term debt disclosure
Total debt, non-current	$ 311,860,000	$ 302,263,000		$ 311,860,000	$ 302,263,000
Aggregate principal amount of convertible senior notes issued						370,000,000
Interest rate on convertible senior notes (as a percent)				2.875%
Interest expense recognized				21,400,000	20,700,000
Interest payments on notes	10,638,000	10,490,000	4,590,000	10,600,000	10,500,000
Maximum availability under the revolving credit facility							450,000,000	350,000,000	450,000,000
Amount of accordion feature							150,000,000	50,000,000
Maximum availability under the revolving credit facility including accordion							600,000,000
Commitment fee (as a percent)							0.25%	0.375%
Revolving credit facility, description of interest rate basis							LIBOR	LIBOR	LIBOR	LIBOR	LIBOR
Revolving credit facility, basis spread on interest rate (as a percent)							1.25%	1.75%	1.25%	1.25%	3.00%
Leverage ratio, maximum							3.5
Maximum leverage ratio for two quarters following the completion of a material permitted acquisition							4.0
Outstanding amount under credit facility									$ 0