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Long-Term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Oct. 21, 2019
Debt Instrument        
Long-term and short-term debt, combined amount $ 519,800   $ 609,900  
Long-term Debt, Current Maturities (35,000)   (116,300)  
Unamortized Debt Issuance Expense (4,300)   (4,700)  
Debt Instrument, Unamortized Discount (7,100)   (7,700)  
Long-term debt 473,400   481,200  
Term Loan        
Debt Instrument        
Long-term debt, gross 519,800   609,900 $ 700,000
Periodic payment of long-term debt principal 8,750      
Excess cash flow prepayment (81,400)      
Letter of Credit        
Debt Instrument        
Maximum borrowing capacity on line of credit 20,000      
Revolving Credit Facility        
Debt Instrument        
Long-term debt, gross 0   0  
Maximum borrowing capacity on line of credit 200,000     $ 200,000
Proceeds from borrowing under line of credit 0 $ 20,000    
Remaining borrowing capacity on line of credit 200,000      
Letters of credit outstanding, amount 0   $ 0  
Debt covenant, maximum undischarged judgments $ 65,000