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DEBT (Details) (USD $)
3 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Jun. 30, 2012
Long-term debt disclosure        
Total debt, non-current $ 314,333,000   $ 311,860,000  
Convertible notes due 2019, net
       
Long-term debt disclosure        
Total debt, non-current 314,333,000   311,860,000  
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 5,400,000 5,300,000    
Revolving credit facility
       
Long-term debt disclosure        
Maximum availability under the revolving credit facility 450,000,000      
Outstanding amount under credit facility $ 0