Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments (Details)

v3.4.0.3
Share-Based Payments (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Restricted Stock [Member]          
Director Fee Plan, aggregate disclosures [Abstract]          
Restricted stock awards unvested (in shares)         31,787
Director Fee Plan [Member]          
Stock option activity [Roll Forward]          
Outstanding, end of period (in shares) 0   0    
Director Fee Plan, aggregate disclosures [Abstract]          
Shares deferred under the Director Fee Plan (in shares)         17,005
Value of annual stock based grant     $ 110    
Total stock options granted to date (in shares)         22,300
Option awards outstanding (in shares) 0   0   0
Total restricted stock awards granted to date (in shares)         152,290
Restricted stock awards unvested (in shares)         49,140
All Plans [Member]          
Share-based compensation, aggregate disclosures [Abstract]          
Total stock-based compensation cost $ 2,741 $ 2,039 $ 5,267 $ 4,564  
Future income tax benefit from compensation expense recognized $ 1,069 795 2,054 1,780  
Cash received from stock options exercised   51 1,798 3,778  
Tax benefit realized from options exercised   $ 6 $ 283 321  
All Plans [Member] | Stock Options [Member]          
Share-based compensation, aggregate disclosures [Abstract]          
Vesting percentage     33.00%    
Expiration period     10 years    
Stock options exercised (in shares) 0   47,834    
Restricted stock activity [Roll Forward]          
Expired or forfeited (in shares)     (89,240)    
Stock option activity [Roll Forward]          
Outstanding, beginning of period (in shares)     337,938    
Exercised (in shares) 0   (47,834)    
Expired or forfeited (in shares)     (98,745)    
Outstanding, end of period (in shares) 191,359   191,359    
Exercisable (in shares) 114,193   114,193    
Outstanding, weighted-average exercise price, beginning of period (in dollars per share)     $ 39.19    
Exercised, weighted-average exercise price (in dollars per share)     37.59    
Expired or forfeited, weighted-average exercise price (in dollars per share)     37.33    
Outstanding, weighted-average exercise price, end of period (in dollars per share) $ 40.56   $ 40.56    
Exercisable, weighted-average exercise price (in dollars per share)         $ 40.56
Outstanding, weighted-average remaining contractual term     7 months 6 days    
Outstanding, aggregate intrinsic value         $ 2,089
Exercisable, weighted-average remaining contractual term     7 months 6 days    
Exercisable, aggregate intrinsic value         $ 1,246
Intrinsic value of options exercised     $ 898 $ 856  
Non-vested options activity [Roll Forward]          
Non-vested at beginning of period (in shares)     166,406    
Expired or forfeited (in shares)     (89,240)    
Non-vested at end of period (in shares) 77,166   77,166    
Non-vested, weighted-average grant-date fair value, beginning of period (in dollars per share)     $ 12.43    
Expired or forfeited, weighted-average grant-date fair value (in dollars per share)     12.56    
Non-vested, weighted-average grant-date fair value, end of period (in dollars per share) $ 12.29   $ 12.29    
Director Fee Plan, aggregate disclosures [Abstract]          
Option awards outstanding (in shares) 191,359   337,938   191,359
All Plans [Member] | Stock Options [Member] | After 3 Years [Member]          
Share-based compensation, aggregate disclosures [Abstract]          
Vesting percentage     33.00%    
Vesting period     3 years    
All Plans [Member] | Stock Options [Member] | After 4 Years [Member]          
Share-based compensation, aggregate disclosures [Abstract]          
Vesting percentage     33.00%    
Vesting period     4 years    
All Plans [Member] | Stock Options [Member] | After 5 Years [Member]          
Share-based compensation, aggregate disclosures [Abstract]          
Vesting percentage     33.00%    
Vesting period     5 years    
All Plans [Member] | Restricted Stock [Member]          
Share-based compensation, aggregate disclosures [Abstract]          
Expiration period     5 years    
Restricted stock activity [Roll Forward]          
Non-vested at beginning of period (in shares)     570,567    
Granted (in shares)     224,125    
Vested (in shares)     (260,947)    
Expired or forfeited (in shares)     (3,385)    
Non-vested at end of period (in shares) 530,360   530,360    
Non-vested weighted-average grant-date fair value, beginning of period (in dollars per share)     $ 33.66    
Granted, weighted-average grant-date fair value (in dollars per share)     51.91    
Vested, weighted-average grant-date fair value (in dollars per share)     30.17    
Expired or forfeited, weighted-average grant-date fair value (in dollars per share)     39.55    
Non-vested weighted-average grant-date fair value, end of period (in dollars per share) $ 45.21   $ 45.21    
Non-vested options activity [Roll Forward]          
Expired or forfeited (in shares)     (3,385)    
Unrecognized compensation cost [Abstract]          
Unrecognized compensation cost on non-vested awards         $ 13,497
Weighted average period of recognition of unrecognized compensation cost on non-vested awards     1 year 9 months 18 days    
Fair value assumptions [Abstract]          
Expected volatility     20.70% 22.20%  
Dividend yield     1.00% 1.00%  
Average risk-free interest rate     1.70% 1.70%  
Average expected term     2 years 1 month 6 days 1 year 9 months 18 days  
All Plans [Member] | Restricted Stock [Member] | After 3 Years [Member]          
Share-based compensation, aggregate disclosures [Abstract]          
Vesting percentage     50.00%    
Vesting period     3 years    
All Plans [Member] | Restricted Stock [Member] | Attainment of Pre-Defined Levels of Appreciation in Market Value [Member]          
Share-based compensation, aggregate disclosures [Abstract]          
Vesting percentage     16.66%    
All Plans [Member] | Restricted Stock [Member] | Fiscal 2013 and Thereafter [Member] | After 3 Years [Member]          
Share-based compensation, aggregate disclosures [Abstract]          
Vesting percentage     50.00%    
Vesting period     3 years    
All Plans [Member] | Restricted Stock [Member] | Fiscal 2013 and Thereafter [Member] | Attainment of Pre-Defined Levels of Appreciation in Market Value [Member]          
Share-based compensation, aggregate disclosures [Abstract]          
Vesting percentage     8.33%    
All Plans [Member] | Restricted Stock [Member] | Fiscal 2013 and Thereafter [Member] | Attainment of Pre-Defined Levels of Adjusted Earnings Per Share [Member]          
Share-based compensation, aggregate disclosures [Abstract]          
Vesting percentage     8.33%    
2012 Equity Incentive Plan [Member]          
Share-based compensation, aggregate disclosures [Abstract]          
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)         1,028,548
2014 Director Fee Plan [Member]          
Share-based compensation, aggregate disclosures [Abstract]          
Shares reserved for future issuance under award plan (in shares)         150,000
Director Fee Plan, aggregate disclosures [Abstract]          
Annual retainer fee paid to non-employee directors     $ 75    
Annual retainer fee paid to non-employee Chairman of the Board     $ 175