Annual report pursuant to Section 13 and 15(d)

SHARE-BASED PAYMENTS - Narrative (Details)

v3.20.2
SHARE-BASED PAYMENTS - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Share-based compensation, aggregate disclosures [Abstract]      
Total stock-based compensation cost $ 8,096 $ 7,729 $ 13,460
Restricted Stock      
Share-based compensation, aggregate disclosures [Abstract]      
Percent of shares vested on time 38.00%    
2012 Equity Incentive Plan      
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    
Shares reserved for future issuance under award plan (in shares) 1,700,000    
Equity Incentive Plan 2017 | Restricted Stock      
Share-based compensation, aggregate disclosures [Abstract]      
Shares granted under the 2017 Equity incentive plan 565,860    
All Plans      
Share-based compensation, aggregate disclosures [Abstract]      
Total stock-based compensation cost $ 8,096 7,729 13,460
Future income tax benefit from compensation expense recognized $ 1,665 1,535 2,826
All Plans | Restricted Stock      
Share-based compensation, aggregate disclosures [Abstract]      
Shares granted under the 2017 Equity incentive plan 303,660    
Unrecognized compensation cost on unvested awards $ 9,122    
Weighted average period of recognition of unrecognized compensation cost on non-vested awards 1 year 9 months 18 days    
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    
Retirement Eligible Employees      
Share-based compensation, aggregate disclosures [Abstract]      
Total stock-based compensation cost $ 1,564 $ 1,849 $ 2,850
2014 Director Fee Plan      
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    
Total restricted stock awards granted to date (in shares) 68,149    
2019 Director Fee Plan      
Share-based compensation, aggregate disclosures [Abstract]      
Shares reserved for future issuance under award plan (in shares) 150,000    
Director Fee Plans      
Director Fee Plan, aggregate disclosures [Abstract]      
Shares deferred under the director fee plan (in shares) 30,764    
Value of annual stock-based grant $ 125    
Total restricted stock awards granted to date (in shares) 241,378    
After 3 Years | Restricted Stock      
Share-based compensation, aggregate disclosures [Abstract]      
Vesting percentage 50.00%    
Attainment of Pre-Defined Levels of Appreciation in Market Value | Restricted Stock      
Share-based compensation, aggregate disclosures [Abstract]      
Vesting percentage 25.00%    
Attainment of Pre-Defined Levels of Adjusted Earnings Per Share | Restricted Stock      
Share-based compensation, aggregate disclosures [Abstract]      
Vesting percentage 25.00%