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Long Term Debt (Term Loan B and Revolver) (Details) - USD ($)
3 Months Ended 9 Months Ended
Jan. 16, 2014
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Term Loan B          
Debt Instrument [Line Items]          
Credit agreement, maximum capacity $ 800,000,000        
Term loan period, years 7 years        
Term loan quarterly repayment as percentage of principal 0.25%        
Interest addition to floating rate 0.75%        
Interest expense   $ 6,400,000 $ 6,400,000 $ 19,500,000 $ 19,600,000
Revolver          
Debt Instrument [Line Items]          
Credit agreement, maximum capacity   $ 300,000,000   $ 300,000,000  
London Interbank Offered Rate (LIBOR) | Term Loan B          
Debt Instrument [Line Items]          
Interest addition to floating rate 2.50%