Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Narrative (Details)

v3.21.2
Share-Based Payments - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation cost $ 5,713 $ 2,539 $ 12,960 $ 7,078
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued under the 2017 Equity incentive plan (in shares)     499,050  
Percent of shares vested on time     45.00%  
Unrecognized compensation cost on non-vested awards $ 12,893   $ 12,893  
Weighted average period of recognition of unrecognized compensation cost on non-vested awards     2 years  
Restricted stock awards unvested (in shares) 74,639   74,639  
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 issued under the 2017 Equity incentive plan (in shares) 75,000   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  
Maximum number of shares available for grants or awards (in shares) 1,700,000   1,700,000  
Shares reserved for future issuance under award plan (in shares) 1,700,000   1,700,000  
2017 Equity Incentive Plan | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued under the 2017 Equity incentive plan (in shares)     1,064,910  
Retirement Eligible Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Future income tax benefit from compensation expense recognized $ 1,467 $ 622 $ 2,443 $ 1,415
Director Fee Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares deferred under stock based compensation plan (in shares) 38,482   38,482  
Value of annual stock based grant     $ 125  
Total restricted stock awards granted to date (in shares) 271,807   271,807  
Restricted stock awards unvested (in shares) 98,578   98,578  
2014 Director Fee Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual retainer fee paid to non-employee directors     $ 85  
Annual retainer fee paid to non-employee Chairman of the Board     $ 185  
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