Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Narrative (Details)

v3.23.2
Share-Based Payments - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2021
Jun. 30, 2023
Jun. 30, 2022
Nov. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total stock-based compensation cost $ 5,023 $ 5,197   $ 13,635 $ 14,128  
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)       618,050    
Percent of shares vested on time       43.00%    
Unrecognized compensation cost on non-vested awards $ 21,695     $ 21,695    
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) 60,057     60,057    
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            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period     3 years      
Expiration period     5 years      
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
Shares issuance under award plan (in shares)       493,758    
Options granted (in shares)       75,000    
Share-based awards outstanding (in shares) 1,801,197     1,801,197    
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)       1,041,615    
Amended 2017 Plan | Performance-Based Restricted Share Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)       1,313,162    
Retirement Eligible Employees            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Future income tax benefit from compensation expense recognized $ 1,249 $ 1,282   $ 2,856 $ 2,970  
Director Fee Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares deferred under stock based compensation plan (in shares) 45,005     45,005    
Value of annual stock based grant       $ 140    
Total restricted stock awards granted to date (in shares) 336,127     336,127    
Restricted stock awards unvested (in shares) 162,898     162,898    
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