DEBT (Details) (USD $)			3 Months Ended		9 Months Ended				0 Months Ended
	Mar. 31, 2014	Jun. 30, 2013	Mar. 31, 2014 Convertible notes due 2019, net	Mar. 31, 2013 Convertible notes due 2019, net	Mar. 31, 2014 Convertible notes due 2019, net	Mar. 31, 2013 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	Mar. 31, 2014 Revolving credit facility
Long-term debt disclosure
Total debt, non-current	$ 309,401,000	$ 302,263,000	$ 309,401,000		$ 309,401,000		$ 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%		2.875%
Interest expense recognized			5,400,000	5,200,000	16,000,000	15,500,000
Maximum availability under the revolving credit facility									450,000,000	350,000,000
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
Revolving credit facility, basis spread on interest rate (as a percent)									1.25%	1.75%
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