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Debt (Narrative) (Details) - USD ($)
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Apr. 01, 2021
Line of Credit Facility [Line Items]      
Amortization of debt issuance costs and discounts $ 467,000 $ 526,000  
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
Revolving Credit Facility | 2021 Credit Agreement      
Line of Credit Facility [Line Items]      
Credit facility borrowing capacity     350,000,000
Letter of Credit | 2021 Credit Agreement      
Line of Credit Facility [Line Items]      
Credit facility borrowing capacity     $ 60,000,000