DEBT (Details) (USD $)	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Long-term debt disclosure
Total debt, non-current	$ 304,604,000		$ 302,263,000
Convertible notes due 2019, net
Long-term debt disclosure
Total debt, non-current	304,604,000		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	5,300,000	5,100,000
Revolving credit facility
Long-term debt disclosure
Maximum availability under the revolving credit facility	350,000,000
Outstanding amount under credit facility	$ 0