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FINANCING ARRANGEMENTS (Details 3) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2013
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Jul. 31, 2009
Debt Instrument [Line Items]          
Proceeds from issuance of long-term debt, net of fees   $ 0 $ 118,058,000 $ 0  
Capital lease balance   120,002,000 293,503,000    
Convertible senior notes          
Debt Instrument [Line Items]          
Principal amount on the convertible senior notes         $ 172,500,000.0
Interest rate percentage         5.00%
Convertible long-term debt amount allocated to equity         $ 24,700,000
Unamortized debt discount     300,000    
Effective interest rate on the convertible debt (as a percent)         8.90%
Revolving credit facility          
Debt Instrument [Line Items]          
Revolving credit facility maximum borrowing capacity   $ 400,000,000.0      
Variable interest rate basis   LIBOR      
Maximum borrowing capacity, optional expansion   $ 200,000,000.0      
Threshold default of other debt to trigger event of default   10,000,000.0      
Revolving credit facility outstanding amount   0 0    
Outstanding standby letters of credit   2,100,000 2,200,000    
Revolving credit facility remaining borrowing capacity   $ 397,900,000 $ 397,800,000    
Senior term notes          
Debt Instrument [Line Items]          
Interest rate percentage   5.75% 5.75%    
Capital lease balance   $ 120,000,000 $ 120,000,000    
Senior term notes | Senior Unsecured Notes Due December 2017          
Debt Instrument [Line Items]          
Principal amount on the convertible senior notes $ 120,000,000.0        
Interest rate percentage 5.75%        
Proceeds from issuance of long-term debt, net of fees $ 118,100,000        
Equipment and leasehold notes payable          
Debt Instrument [Line Items]          
Capital lease balance   $ 2,000 $ 1,257,000