Annual report pursuant to Section 13 and 15(d)

Debt - Additional Information (Details)

v3.24.3
Debt - Additional Information (Details)
 12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Jul. 01, 2022
USD ($)
Jun. 30, 2022
USD ($)
Debt Instrument [Line Items]          
Debt issuance costs $ 1,514,000 $ 1,110,000      
Long-term debt 515,038,000        
Interest expense, borrowings 23,200,000 18,700,000 $ 7,900,000    
Amortization of deferred debt issuance costs $ 400,000 $ 300,000 $ 200,000    
Line of Credit          
Debt Instrument [Line Items]          
Fixed coverage ratio 3.15 2.56      
Leverage ratio 1.81 1.72      
Interest Rate Swap          
Debt Instrument [Line Items]          
Notional amount $ 300,000,000.0 $ 300,000,000.0   $ 300,000,000  
Fair value of interest rate swaps $ 11,600,000 26,900,000      
Minimum | Credit Agreement | Line of Credit          
Debt Instrument [Line Items]          
Fixed coverage ratio 1.20        
Maximum | Credit Agreement | Line of Credit          
Debt Instrument [Line Items]          
Fixed coverage ratio 3.50        
Term Loan | Term Loan A/Revolver Credit Agreement | Line of Credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity         $ 375,000,000
Debt issuance costs $ 800,000        
Term Loan | Initial Term Loan | Line of Credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity         250,000,000
Term Loan | Incremental Term Loan | Line of Credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity         125,000,000
Term Loan | Delayed Draw Term Facility | Line of Credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity         50,000,000
Term Loan | Term Loan - 11 Quarters | Line of Credit          
Debt Instrument [Line Items]          
Line of credit, principal repayment rate 1.25%        
Term Loan | Term Loan - 8 Quarters | Line of Credit          
Debt Instrument [Line Items]          
Line of credit, principal repayment rate 1.875%        
Term Loan | Term Loan | Line of Credit          
Debt Instrument [Line Items]          
Long-term debt $ 392,200,000 283,800,000      
Term Loan | Maximum | Credit Agreement | Line of Credit          
Debt Instrument [Line Items]          
Leverage ratio 3.50        
Term Loan | Term SOFR | Term Loan | Line of Credit          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.10%        
Term Loan | Daily Simple SOFR | Term Loan | Line of Credit          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.10%        
Revolving Credit Facility | Line of Credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 400,000,000       $ 400,000,000
Long-term debt 122,900,000 93,100,000      
Remaining borrowing capacity $ 268,800,000 $ 222,100,000