Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Narrative (Details)

v3.7.0.1
Share-Based Payments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options exercised (in shares) 0 0      
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 0   0    
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock awards unvested (in shares) 25,157   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   2,500,000    
Shares reserved for future issuance under award plan (in shares) 589,238   589,238    
All Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total stock-based compensation cost $ 2,920 $ 2,741 $ 9,017 $ 5,267  
Cash received from stock options exercised     14 1,798  
Tax benefit realized from options exercised     $ 3 283  
All Plans | Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 0   0   77,733
Stock options exercised (in shares)     333    
Intrinsic value of options exercised     $ 9 898  
All Plans | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period     5 years    
Unrecognized compensation cost on non-vested awards $ 12,339   $ 12,339    
Weighted average period of recognition of unrecognized compensation cost on non-vested awards     1 year 7 months 8 days    
All Plans | Restricted Stock | After 3 Years          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Vesting increment     50.00%    
All Plans | Fiscal 2013 and Thereafter | Restricted Stock | After 3 Years          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Vesting increment     50.00%    
All Plans | Fiscal 2013 and Thereafter | 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     8.33%    
All Plans | Fiscal 2013 and Thereafter | 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     8.33%    
Retirement Eligible Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total stock-based compensation cost     $ 3,337    
Future income tax benefit from compensation expense recognized $ 1,139 $ 1,069 $ 3,517 $ 2,054  
2014 Director Fee Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares reserved for future issuance under award plan (in shares) 150,000   150,000    
Annual retainer fee paid to non-employee directors     $ 75    
Annual retainer fee paid to non-employee Chairman of the Board     $ 175    
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) 22,942   22,942    
Value of annual stock based grant     $ 125    
Total stock options granted to date (in shares) 22,300   22,300    
Total restricted stock awards granted to date (in shares) 161,724   161,724    
Restricted stock awards unvested (in shares) 58,574   58,574