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Long Term Debt (Term Loan B and Revolver) (Details) - USD ($)
3 Months Ended
Jan. 16, 2014
Sep. 30, 2015
Sep. 30, 2014
Nov. 09, 2011
Term Loan B [Member]        
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   $ 6,500,000 $ 6,600,000  
Revolver [Member]        
Debt Instrument [Line Items]        
Credit agreement, maximum capacity       $ 300,000,000
London Interbank Offered Rate (LIBOR) [Member] | Term Loan B [Member]        
Debt Instrument [Line Items]        
Interest addition to floating rate 2.50%