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Long-Term Debt (Term Loan A and Revolver) (Narrative) (Details) (USD $)
 2 Months Ended 3 Months Ended
Dec. 31, 2011
Sep. 30, 2014
Sep. 30, 2013
Nov. 09, 2011
Term Loan A [Member]
        
Debt Instrument [Line Items]        
Credit agreement, maximum capacity       $ 600,000,000
Term loan period, years 5 years      
Term loan repayment as percentage of principal in year 1 1.25%      
Term loan repayment as percentage of principal in year 2 1.25%      
Term loan repayment as percentage of principal in year 3 1.88%      
Term loan repayment as percentage of principal in year 4 1.88%      
Term loan repayment as percentage of principal in year 5 2.50%      
Interest expense   3,700,000 3,500,000  
Revolving Credit Facility [Member]
        
Debt Instrument [Line Items]        
Credit agreement, maximum capacity       $ 100,000,000
Revolver credit agreement term, years 5 years      
LIBOR [Member] | Term Loan A [Member]
        
Debt Instrument [Line Items]        
Interest addition to floating rate   2.50%