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Derivative Instruments (Derivative Instruments Outstanding) (Details) - Designated as Hedging Instrument - Interest Rate Swaps - USD ($)
$ in Thousands
Apr. 14, 2019
Sep. 30, 2018
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value $ (12,216) $ (703)
Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value (1,308) (26)
Other Noncurrent Liabilities    
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value (10,908) (1,266)
Other Noncurrent Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Noncurrent $ 0 $ 589