Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Narrative (Details)

v3.22.2
Share-Based Payments - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Nov. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total stock-based compensation cost $ 5,197 $ 5,713 $ 14,128 $ 12,960  
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)     670,317    
Percent of shares vested on time     42.00%    
Unrecognized compensation cost on non-vested awards $ 21,698   $ 21,698    
Weighted average period of recognition of unrecognized compensation cost on non-vested awards     2 years 4 months 24 days    
Restricted stock awards unvested (in shares) 58,008   58,008    
Restricted Stock | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period     3 years    
Restricted Stock | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period     5 years    
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]          
Expiration period   5 years      
Award vesting period   3 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)     215,618    
Options granted (in shares)     75,000    
Share-based awards outstanding (in shares) 1,503,012   1,503,012    
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)     789,015    
Amended 2017 Plan | Performance-Based Restricted Share Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)     946,212    
Retirement Eligible Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Future income tax benefit from compensation expense recognized $ 1,282 $ 1,467 $ 2,970 $ 2,443  
Director Fee Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares deferred under stock based compensation plan (in shares) 45,191   45,191    
Value of annual stock based grant     $ 140    
Total restricted stock awards granted to date (in shares) 305,911   305,911    
Restricted stock awards unvested (in shares) 132,682   132,682    
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]          
Maximum number of shares available for grants or awards (in shares) 150,000   150,000