Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Additional Information (Details)

v3.24.3
Share-Based Compensation - Additional Information (Details)
$ in Thousands
 1 Months Ended 12 Months Ended 15 Months Ended
Sep. 30, 2024
USD ($)
installment
shares
Mar. 31, 2024
shares
Sep. 30, 2024
USD ($)
installment
shares
Sep. 30, 2023
USD ($)
shares
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2024
USD ($)
installment
shares
Sep. 30, 2021
shares
May 31, 2021
shares
Sep. 30, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Compensation expense recorded upon vesting of awards | $     $ 15,031 $ 10,759 $ 8,000        
Class A Common Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Issuance of stock grant awards (in shares)     55,358            
Performance Stock Units                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares awarded (in shares)     113,044            
Vested (in shares)     84,783            
Aggregate grant date fair value of awards | $ $ 5,500   $ 5,500     $ 5,500      
Weighted average recognition period remaining, in years     2 years 1 month 6 days            
Performance Stock Units | Class A Common Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Forecasted unvested restricted shares of Class A common stock (in shares) 149,807   149,807     149,807      
Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares awarded (in shares)     110,113 210,412 256,167        
Vested (in shares)     421,873 76,963 134,481        
Aggregate grant date fair value of awards | $ $ 5,032   $ 5,032 $ 5,514 $ 8,356 $ 5,032      
Compensation expense recorded upon vesting of awards | $     $ 8,416 $ 8,717 $ 6,966        
Forecasted unvested restricted shares of Class A common stock (in shares) 509,171   509,171 824,280 715,724 509,171 595,561    
Unrecognized compensation expense at fiscal year-end | $ $ 6,331   $ 6,331 $ 9,766 $ 15,152 $ 6,331      
Weighted average recognition period remaining, in years     2 years 6 months 2 years 6 months 2 years 6 months        
Liability classified awards                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Compensation expense recorded upon vesting of awards | $     $ 3,677 $ 0 $ 0        
Shares forfeited     5,352            
Aggregate grant date fair value | $ 5,100   $ 7,600            
Current liability for cash-settled restricted stock units | $ $ 3,700   $ 3,700 0   $ 3,700      
Liability classified awards | Class A Common Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares issued (in shares)     114,264            
Employee stock purchase plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Maximum number of shares offered under the ESPP (in shares)               1,000,000  
Compensation expense recorded upon vesting of awards | $     $ 619 0 0        
Shares issued (in shares)           47,349      
Minimum | Performance Stock Units                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Percentage of final number of common stock issuable upon vesting of performance stock units     0            
Maximum | Performance Stock Units                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Percentage of final number of common stock issuable upon vesting of performance stock units     1.50            
Percentage increase (decrease) of awards granted due to total shareholder return ranking     0.15            
Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Maximum number of shares offered under the ESPP (in shares)                 2,000,000
Additional shares authorized (in shares)   1,000,000              
Shares available for issuance (in shares) 1,241,710   1,241,710     1,241,710      
Equity Incentive Plan | Performance Stock Units | Class A Common Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Compensation expense recorded upon vesting of awards | $     $ 2,300 2,000          
Unrecognized compensation expense at fiscal year-end | $ $ 3,900   3,900     $ 3,900      
Equity Incentive Plan | Liability classified awards | Class A Common Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Compensation expense recorded upon vesting of awards | $     3,700 $ 0 $ 0        
Unrecognized compensation expense | $ $ 3,900   $ 3,900     $ 3,900      
Unrecognized compensation expense, period for recognition (years)     3 years            
Requisite service period, number of equal annual installments | installment 4   4     4      
Restricted Stock Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Maximum number of shares offered under the ESPP (in shares)   2,000,000              
Shares available for issuance (in shares) 2,000,000   2,000,000     2,000,000