Annual report pursuant to Section 13 and 15(d)

SHARE-BASED PAYMENTS - Narrative (Details)

v3.21.2
SHARE-BASED PAYMENTS - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Nov. 30, 2021
Share-based compensation, aggregate disclosures [Abstract]            
Total stock-based compensation cost     $ 15,581 $ 8,096 $ 7,729  
Restricted Stock            
Share-based compensation, aggregate disclosures [Abstract]            
Percent of shares vested on time     42.00%      
Share-based Payment Arrangement, Option            
Share-based compensation, aggregate disclosures [Abstract]            
Expiration period (in years)     5 years      
Award vesting period     3 years      
Equity Incentive Plan 2017            
Share-based compensation, aggregate disclosures [Abstract]            
Term of plan (in years)     10 years      
Maximum number of shares available for grants or awards (in shares) 1,700,000   1,700,000      
Shares issued (in shares) 37,640          
Grants in period (in shares)   75,000        
Share-based awards outstanding (in shares) 1,087,445   1,087,445      
Grants in period, exercise price (in dollars per share)   $ 41.70        
Equity Incentive Plan 2017 | Subsequent Event            
Share-based compensation, aggregate disclosures [Abstract]            
Shares reserved for future issuance under award plan (in shares)           3,450,000
Equity Incentive Plan 2017 | Time-Based Restricted Share Units            
Share-based compensation, aggregate disclosures [Abstract]            
Grants in period (in shares)     478,963      
Director Fee Plan, aggregate disclosures [Abstract]            
Grants in period (in shares)     478,963      
Equity Incentive Plan 2017 | Performance-Based Restricted Share Units            
Share-based compensation, aggregate disclosures [Abstract]            
Grants in period (in shares)     585,947      
Director Fee Plan, aggregate disclosures [Abstract]            
Grants in period (in shares)     585,947      
All Plans            
Share-based compensation, aggregate disclosures [Abstract]            
Total stock-based compensation cost     $ 15,581 8,096 7,729  
Future income tax benefit from compensation expense recognized     3,247 $ 1,665 $ 1,535  
Unrecognized compensation cost on unvested awards $ 10,858   $ 10,858      
Weighted average period of recognition of unrecognized compensation cost on non-vested awards     1 year 9 months 18 days      
All Plans | Restricted Stock            
Share-based compensation, aggregate disclosures [Abstract]            
Grants in period (in shares)     499,050      
Director Fee Plan, aggregate disclosures [Abstract]            
Grants in period (in shares)     499,050      
Unvested shares (in shares) 1,083,365   1,083,365 750,322    
All Plans | Restricted Stock | Minimum            
Share-based compensation, aggregate disclosures [Abstract]            
Expiration period (in years)     3 years      
All Plans | Restricted Stock | Maximum            
Share-based compensation, aggregate disclosures [Abstract]            
Expiration period (in years)     5 years      
Director Fee Plans            
Director Fee Plan, aggregate disclosures [Abstract]            
Shares deferred under the director fee plan (in shares) 38,657   38,657      
Value of annual stock-based grant     $ 125      
Director Fee Plans | Restricted Stock            
Share-based compensation, aggregate disclosures [Abstract]            
Grants in period (in shares) 271,807          
Director Fee Plan, aggregate disclosures [Abstract]            
Grants in period (in shares) 271,807          
2019 Director Fee Plan            
Share-based compensation, aggregate disclosures [Abstract]            
Shares reserved for future issuance under award plan (in shares) 150,000   150,000      
Director Fee Plan, aggregate disclosures [Abstract]            
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 | Restricted Stock            
Share-based compensation, aggregate disclosures [Abstract]            
Grants in period (in shares) 98,578          
Director Fee Plan, aggregate disclosures [Abstract]            
Grants in period (in shares) 98,578          
Unvested shares (in shares) 74,639   74,639      
Share-based Payment Arrangement, Tranche One | Restricted Stock            
Share-based compensation, aggregate disclosures [Abstract]            
Vesting percentage     50.00%      
Share-based Payment Arrangement, Tranche One | Share-based Payment Arrangement, Option            
Share-based compensation, aggregate disclosures [Abstract]            
Vesting percentage     33.33%      
Share-based Payment Arrangement, Tranche Two | Restricted Stock            
Share-based compensation, aggregate disclosures [Abstract]            
Vesting percentage     25.00%      
Share-based Payment Arrangement, Tranche Two | Share-based Payment Arrangement, Option            
Share-based compensation, aggregate disclosures [Abstract]            
Vesting percentage     33.33%      
Share-based Payment Arrangement, Tranche Three | Restricted Stock            
Share-based compensation, aggregate disclosures [Abstract]            
Vesting percentage     25.00%      
Share-based Payment Arrangement, Tranche Three | Share-based Payment Arrangement, Option            
Share-based compensation, aggregate disclosures [Abstract]            
Vesting percentage     33.33%