Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Narrative (Details)

v3.8.0.1
Share-Based Payments - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Proceeds from the exercise of stock options     $ 0 $ 14,000
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock awards unvested (in shares) 20,940   20,940  
2012 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  
All Plans        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation cost $ 2,658,000 $ 2,920,000 $ 8,132,000 9,017,000
Proceeds from the exercise of stock options   0   14,000
Intrinsic value of options exercised       9,000
All Plans | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost on non-vested awards 10,906,000   $ 10,906,000  
Weighted average period of recognition of unrecognized compensation cost on non-vested awards     1 year 7 months 6 days  
All Plans | Restricted Stock | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period     3 years  
All Plans | Restricted Stock | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period     5 years  
All Plans | Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Future income tax benefit from compensation expense recognized       3,000
All Plans | Before Fiscal 2013 | Restricted Stock | After 3 Years        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting increment     50.00%  
Vesting period     3 years  
All Plans | Before Fiscal 2013 | Restricted Stock | Attainment of Pre-Defined Levels of Appreciation in Market Value        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting increment     16.66%  
All Plans | Before Fiscal 2013 | Restricted Stock | Attainment of Pre-Defined Levels of Adjusted Earnings Per Share        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting increment     16.66%  
Retirement Eligible Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation cost     $ 2,850,000 3,337,000
Future income tax benefit from compensation expense recognized $ 651,000 $ 1,139,000 $ 1,521,000 $ 3,517,000
2014 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  
Annual retainer fee paid to non-employee directors     $ 85,000  
Annual retainer fee paid to non-employee Chairman of the Board     $ 185,000  
Director Fee Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding (in shares) 0   0  
Shares deferred under stock based compensation plan (in shares) 22,652   22,652  
Value of annual stock based grant     $ 125,000  
Total stock options granted to date (in shares) 22,300   22,300  
Total restricted stock awards granted to date (in shares) 173,229   173,229  
Restricted stock awards unvested (in shares) 70,079   70,079