Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Narrative (Details)

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Share-Based Payments - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Jun. 30, 2021
Mar. 31, 2024
Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total stock-based compensation cost $ 4,327 $ 4,278   $ 8,978 $ 8,612
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)       458,320  
Percent of shares vested on time       40.00%  
Unrecognized compensation cost on non-vested awards $ 28,205     $ 28,205  
Weighted average period of recognition of unrecognized compensation cost on non-vested awards       2 years 2 months 12 days  
Restricted stock awards unvested (in shares) 67,560     67,560  
Restricted Stock | Tranche One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting increment       50.00%  
Restricted Stock | Tranche Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting increment       25.00%  
Restricted Stock | Tranche Three          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting increment       25.00%  
Stock Options | Tranche One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting increment       33.33%  
Stock Options | Tranche Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting increment       33.33%  
Stock Options | Tranche Three          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting increment       33.33%  
2017 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted (in shares)     75,000    
Share price of options granted (in dollars per share)     $ 41.70    
2017 Equity Incentive Plan | Stock Compensation Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of plan       10 years  
Amended 2017 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares reserved for future issuance under award plan (in shares) 3,450,000     3,450,000  
Shares issuance under award plan (in shares)       1,178,558  
Options granted (in shares)       75,000  
Share-based awards outstanding (in shares) 1,720,892     1,720,892  
Percentage of outstanding stock maximum       200.00%  
Amended 2017 Plan | Time-Based Restricted Share Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)       1,233,583  
Amended 2017 Plan | Performance-Based Restricted Share Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)       1,579,514  
Retirement Eligible Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Future income tax benefit from compensation expense recognized $ 1,093 $ 1,057   $ 1,778 $ 1,608
Director Fee Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares deferred under stock based compensation plan (in shares) 50,355     50,355  
Value of annual stock based grant       $ 140  
Total restricted stock awards granted to date (in shares) 373,471     373,471  
Restricted stock awards unvested (in shares) 200,242     200,242  
2014 Director Fee Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Annual retainer fee paid to non-employee directors       $ 90  
Annual retainer fee paid to non-employee Chairman of the Board       $ 210  
2019 Director Fee Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for grants or awards (in shares) 300,000     300,000