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Derivative Instruments (Derivative Instruments Outstanding) (Details) - Designated as Hedging Instrument - Interest Rate Swaps - USD ($)
$ in Thousands
Jul. 07, 2019
Sep. 30, 2018
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value $ 0 $ 703
Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value 0 26
Other long-term liabilities    
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value 0 1,266
Other assets, net    
Derivatives, Fair Value [Line Items]    
Total assets at fair value $ 0 $ (589)