Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Narrative (Details)

v3.6.0.2
Share-Based Payments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options outstanding (in shares) 0    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awards unvested (in shares) 29,492    
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) 589,238    
All Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation cost $ 6,097 $ 2,526  
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]      
Vesting increment 33.00%    
Expiration period 10 years    
Options outstanding (in shares) 0   77,733
Intrinsic value of options exercised $ 9 898  
All Plans | Employee Stock Option | After 3 Years      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting increment 33.00%    
Vesting period 3 years    
All Plans | Employee Stock Option | After 4 Years      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting increment 33.00%    
Vesting period 4 years    
All Plans | Employee Stock Option | After 5 Years      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting increment 33.00%    
Vesting period 5 years    
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 $ 15,064    
Weighted average period of recognition of unrecognized compensation cost on non-vested awards 1 year 9 months 18 days    
All Plans | 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 | Fiscal 2013 and Thereafter | 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 | 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 $ 2,378 $ 985  
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    
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    
Shares deferred under stock based compensation plan 17,005    
Value of annual stock based grant $ 110    
Total stock options granted to date (in shares) 22,300    
Total restricted stock awards granted to date (in shares) 152,290    
Restricted stock awards unvested (in shares) 49,140