Quarterly report [Sections 13 or 15(d)]

Share-Based Payments - Narrative (Details)

v3.25.1
Share-Based Payments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation cost $ 6,018 $ 4,327 $ 10,997 $ 8,978
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)     668,700  
Percent of shares vested on time     40.00%  
Unrecognized compensation cost on non-vested awards $ 28,080   $ 28,080  
Weighted average period of recognition of unrecognized compensation cost on non-vested awards     2 years 1 month 6 days  
Restricted stock awards unvested (in shares) 98,945   98,945  
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) 4,950,000   4,950,000  
Shares issuance under award plan (in shares)     1,734,834  
Options granted (in shares)     75,000  
Share-based awards outstanding (in shares) 1,818,068   1,818,068  
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)     1,517,963  
Amended 2017 Plan | Performance-Based Restricted Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)     1,961,834  
Retirement Eligible Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Future income tax benefit from compensation expense recognized $ 1,520 $ 1,093 $ 2,338 $ 1,778
Director Fee Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares deferred under stock based compensation plan (in shares) 56,067   56,067  
Value of annual stock based grant     $ 140  
Total restricted stock awards granted to date (in shares) 439,740   439,740  
Restricted stock awards unvested (in shares) 266,511   266,511  
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