Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Narrative (Details)

v3.8.0.1
Share-Based Payments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options exercised (in shares) 0  
Proceeds from the exercise of stock options $ 0 $ 14
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock awards unvested (in shares) 25,157  
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) 2,500,000  
Shares reserved for future issuance under award plan (in shares) 121,038  
All Plans    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation cost $ 5,474 6,097
Proceeds from the exercise of stock options   14
Intrinsic value of options exercised   9
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
All Plans | Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost on non-vested awards $ 13,338  
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 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 | 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%  
Retirement Eligible Employees    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation cost $ 2,850 3,337
Future income tax benefit from compensation expense recognized $ 1,341 $ 2,378
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  
Annual retainer fee paid to non-employee directors $ 85  
Annual retainer fee paid to non-employee Chairman of the Board $ 185  
Director Fee Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding (in shares) 0  
Shares deferred under stock based compensation plan (in shares) 16,139  
Value of annual stock based grant $ 125  
Total stock options granted to date (in shares) 22,300  
Total restricted stock awards granted to date (in shares) 161,724  
Restricted stock awards unvested (in shares) 58,574