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DEBT (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
May 02, 2016
May 09, 2011
May 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2016
Debt Disclosure [Line Items]            
Proceeds from issuance of senior notes, net of issuance costs       $ 0 $ 489,670,000  
Latest amendment date of Credit Agreement May 02, 2016          
Initiation date of credit agreement   May 09, 2011        
Credit facility expiration date       May 09, 2019    
Commitment fee percentage       0.37%    
Outstanding borrowings under line of credit       $ 0   $ 0
Minimum required liquid funds       300,000,000.0    
Restructuring charges       $ (1,048,000) $ 0 16,200,000
Line Of Credit Facility Interest Rate Spread Below The Banks Announced Prime Rate [Member]            
Debt Disclosure [Line Items]            
Spread for interest rate       1.20%    
Line Of Credit Facility Interest Rate Spread Above A Daily One Month LIBOR Rate [Member]            
Debt Disclosure [Line Items]            
Spread for interest rate       1.40%    
Senior Notes [Member] | 5.50% Senior Notes [Member]            
Debt Disclosure [Line Items]            
Principal amount of debt issued     $ 500,000,000.0      
Stated interest rate of debt instrument     5.50% 5.50%    
Proceeds from issuance of senior notes, net of issuance costs     $ 488,400,000      
Debt issuance costs     $ 11,600,000      
Debt redemption percentage price, Specified Price     105.50%      
Repurchase price, percentage of principal amount     101.00%      
Minimum [Member] | Senior Notes [Member] | 5.50% Senior Notes [Member]            
Debt Disclosure [Line Items]            
Debt redemption notice period     30 days      
Maximum [Member] | Senior Notes [Member] | 5.50% Senior Notes [Member]            
Debt Disclosure [Line Items]            
Debt redemption notice period     60 days      
Percentage of debt redeemed     35.00%      
Level 2 [Member] | Fair Value [Member] | Senior Notes [Member] | 5.50% Senior Notes [Member]            
Debt Disclosure [Line Items]            
Long-term debt, 5.50% Senior Notes       $ 496,250,000   493,440,000
Level 2 [Member] | Carrying Value [Member] | Senior Notes [Member] | 5.50% Senior Notes [Member]            
Debt Disclosure [Line Items]            
Long-term debt, 5.50% Senior Notes       $ 489,971,000   $ 489,609,000
Revolving Credit Facility [Member]            
Debt Disclosure [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity $ 100,000,000.0