Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments (Details)

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Share-Based Payments (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based compensation, aggregate disclosures [Abstract]        
Total stock-based compensation cost $ 2,274 $ 1,667 $ 6,838 $ 4,906
Future income tax benefit from compensation expense recognized 887 650 2,667 1,913
Cash received from stock options exercised 129 217 3,907 2,045
Tax benefit realized from options exercised $ 16 $ 1 $ 337 $ 186
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) 1,476,798      
Restricted Stock [Member]        
Share-based compensation, aggregate disclosures [Abstract]        
Vesting rights     With respect to outstanding restricted share grants, for grants made prior to fiscal 2013, generally one-half of the shares vest on the third anniversary of the grant date, with the remaining one-half of the shares vesting in one-third increments upon attainment of pre-defined levels of appreciation in the market value of the Company’s Class A Common Stock.  
Award expiration     Unvested restricted shares generally expire on the earlier of five years from the date of grant, upon employment termination, or within specified time limits following voluntary employment termination (with the consent of the Company), retirement or death. The Company issues restricted shares from treasury shares.  
Restricted stock activity [Roll Forward]        
Non-vested at beginning of period (in shares)     575,150  
Granted (in shares)     215,370  
Vested (in shares)     (158,992)  
Expired or forfeited (in shares)     (36,294)  
Non-vested at end of period (in shares) 595,234   595,234  
Non-vested weighted-average grant-date fair value, beginning of period (in dollars per share)     $ 33.83  
Granted, weighted-average grant-date fair value (in dollars per share)     40.07  
Vested, weighted-average grant-date fair value (in dollars per share)     34.42  
Expired or forfeited, weighted-average grant-date fair value (in dollars per share)     28.53  
Non-vested weighted-average grant-date fair value, end of period (in dollars per share) $ 36.26   $ 36.26  
Unrecognized compensation cost [Abstract]        
Unrecognized compensation cost on non-vested awards $ 9,774      
Weighted average period of recognition of unrecognized compensation cost on non-vested awards     1 year 8 months 12 days  
Fair value assumptions [Abstract]        
Expected volatility (in hundredths)     22.20% 26.60%
Dividend yield (in hundredths)     1.00% 1.10%
Average risk-free interest rate (in hundredths)     1.70% 1.40%
Average expected term     1 year 9 months 18 days 2 years
Stock Options [Member]        
Share-based compensation, aggregate disclosures [Abstract]        
Exercisable rights     Outstanding stock options are generally exercisable in one-third increments upon the attainment of pre-defined levels of appreciation in the market value of the Company’s Class A Common Stock.  
Vesting rights     Options generally vest in one-third increments after three, four and five years, respectively, from the grant date (but, in any event, not until the attainment of the market value thresholds)  
Award expiration     The options expire on the earlier of ten years from the date of grant, upon employment termination, or within specified time limits following voluntary employment termination (with the consent of the Company), retirement or death. The Company generally settles employee stock option exercises with treasury shares., upon employment termination, or within specified time limits following voluntary employment termination (with the consent of the Company), retirement or death. The Company generally settles employee stock option exercises with treasury shares.  
Stock option activity [Roll Forward]        
Outstanding, beginning of period (in shares)     512,322  
Exercised (in shares)     (102,544)  
Expired or forfeited (in shares)     (69,173)  
Outstanding, end of period (in shares) 340,605   340,605  
Exercisable (in shares) 97,000   97,000  
Outstanding, weighted-average exercise price, beginning of period (in dollars per share)     $ 38.62  
Exercised, weighted-average exercise price (in dollars per share)     38.10  
Expired or forfeited, weighted-average exercise price (in dollars per share)     36.53  
Outstanding, weighted-average exercise price, end of period (in dollars per share) $ 39.20   $ 39.20  
Exercisable, weighted-average exercise price (in dollars per share) $ 38.78      
Outstanding, weighted-average remaining contractual term     1 year  
Outstanding, aggregate intrinsic value $ 4,747      
Exercisable, weighted-average remaining contractual term     9 months 18 days  
Exercisable, aggregate intrinsic value $ 1,392      
Intrinsic value of options exercised     $ 897 $ 510
Non-vested options activity [Roll Forward]        
Non-vested at beginning of period (in shares)     312,442  
Expired or forfeited (in shares)     (68,837)  
Non-vested at end of period (in shares) 243,605   243,605  
Non-vested, weighted-average grant-date fair value, beginning of period (in dollars per share)     $ 11.21  
Expired or forfeited, weighted-average grant-date fair value (in dollars per share)     11.70  
Non-vested, weighted-average grant-date fair value, end of period (in dollars per share) $ 11.07   $ 11.07  
Director Fee Plan, aggregate disclosures [Abstract]        
Option awards outstanding (in shares) 340,605   512,322  
Director Fee Plan [Member]        
Share-based compensation, aggregate disclosures [Abstract]        
Shares reserved for future issuance under award plan (in shares) 150,000      
Stock option activity [Roll Forward]        
Outstanding, end of period (in shares) 0   0  
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  
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  
Total restricted stock awards granted to date (in shares) 136,568      
Restricted stock awards unvested (in shares) 33,418