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Financing Arrangements - Extinguishment of Debt (Details) - USD ($)
$ in Thousands
9 Months Ended
Mar. 27, 2020
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Financial arrangement        
Loss on extinguishment of debt   $ 16,090 $ 0  
Debt extinguishment make whole payment   $ 15,856    
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%