Annual report pursuant to Section 13 and 15(d)

Debt - Additional Information (Details)

v3.21.2
Debt - Additional Information (Details)
12 Months Ended
Sep. 30, 2021
USD ($)
payment
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Aug. 13, 2021
USD ($)
Jun. 24, 2021
USD ($)
Debt Instrument [Line Items]          
Long-term debt $ 217,500,000        
Fixed coverage ratio   3.29 2.85    
Leverage ratio   1.99 1.08    
Notional amount       $ 160,000,000  
Interest expense, borrowings 2,500,000 $ 3,600,000 $ 3,300,000    
Amortization of deferred issuance costs and debt discounts 300,000 200,000 $ 100,000    
Interest rate swap contracts          
Debt Instrument [Line Items]          
Notional amount 198,300,000 46,500,000      
Derivative assets (liabilities), at fair value, net (800,000) (1,700,000)      
Revolving Credit Facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity         $ 225,000,000
Long-term debt 20,000,000 0      
Remaining borrowing capacity 193,700,000 39,300,000      
Term Loan          
Debt Instrument [Line Items]          
Maximum borrowing capacity         $ 200,000,000
Long-term debt $ 197,500,000 $ 92,900,000      
Term Loan - 11 Loan Payments          
Debt Instrument [Line Items]          
Interest rate, percentage 1.25%        
Number of quarter end payment dates | payment 11        
Term Loan - Last 7 Loan Payments          
Debt Instrument [Line Items]          
Interest rate, percentage 1.875%        
Number of quarter end payment dates | payment 7        
Credit Agreement          
Debt Instrument [Line Items]          
Fixed coverage ratio 1.20        
Maximum consolidated coverage ratio   3.00