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Financing Arrangements - Extinguishment of Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 27, 2020
Mar. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Financial arrangement          
Principal payments on long-term borrowings   $ 199,833 $ 199,833    
Loss on extinguishment of debt   16,090 16,090 $ 0  
Debt extinguishment make whole payment   15,856 15,856    
Deferred financing fees   $ 2,517 $ 2,517    
Revolving Credit Agreement          
Financial arrangement          
Borrowings outstanding         $ 226,500
Maximum borrowing capacity under credit agreement         800,000
Senior unsecured notes          
Financial arrangement          
Principal amount of debt instrument         $ 200,000
Principal payments on long-term borrowings $ 189,300        
Loss on extinguishment of debt 16,100        
Debt extinguishment make whole payment 15,900        
Deferred financing fees $ 200        
Senior unsecured notes | Minimum          
Financial arrangement          
Interest rate (as a percent)         3.35%
Senior unsecured notes | Maximum          
Financial arrangement          
Interest rate (as a percent)         3.93%