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Debt (Narrative) (Details)
3 Months Ended 6 Months Ended
Apr. 01, 2021
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Line of Credit Facility [Line Items]          
Debt covenant, springing maximum first lien ratio 5.55        
Amortization of debt issuance costs and discounts   $ 467,000 $ 459,000 $ 943,000 $ 926,000
Maximum          
Line of Credit Facility [Line Items]          
Accounts receivable from securitization $ 150,000,000        
2021 Credit Agreement | Term Loan          
Line of Credit Facility [Line Items]          
Amount of loan 475,000,000        
2021 Credit Agreement | Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Borrowing availability 350,000,000        
2021 Credit Agreement | Letter of Credit          
Line of Credit Facility [Line Items]          
Borrowing availability $ 60,000,000