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Debt (Accounts Receivable Securitization) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Apr. 01, 2021
Sep. 30, 2020
Line of Credit Facility [Line Items]      
Accounts Receivable from Securitization   $ 142,200  
Outstanding borrowings $ 754,943   $ 885,470
Maximum      
Line of Credit Facility [Line Items]      
Accounts Receivable from Securitization   $ 150,000  
Securitization Facility, due April 1, 2024      
Line of Credit Facility [Line Items]      
Debt instrument, interest rate, 1.33%    
Debt instrument, basis spread on variable rate 1.25%    
Securitization Facility, due April 1, 2024 | LIBOR      
Line of Credit Facility [Line Items]      
Debt instrument, basis spread on variable rate 0.08%