Quarterly report pursuant to Section 13 or 15(d)

Share Based Payments (Details)

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Share Based Payments (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Share-based compensation, aggregate disclosures [Abstract]    
Total stock-based compensation cost $ 1,574 $ 1,379
Future income tax benefit from compensation expense recognized 614 538
Cash received from stock options exercised 1,855 475
Tax benefit realized from options exercised 177 63
2007 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) 2,097,550  
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, 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) 641,399  
Granted (in shares) 201,225  
Vested (in shares) (196,009)  
Expired or forfeited (in shares) (74,750)  
Non-vested at end of period (in shares) 571,865  
Non-vested weighted-average grant-date fair value, beginning of period (in dollars per share) $ 29.46  
Granted, weighted-average grant-date fair value (in dollars per share) $ 35.71  
Vested, weighted-average grant-date fair value (in dollars per share) $ 29.99  
Expired or forfeited, weighted-average grant-date fair value (in dollars per share) $ 30.85  
Non-vested weighted-average grant-date fair value, end of period (in dollars per share) $ 31.30  
Unrecognized compensation cost [Abstract]    
Unrecognized compensation cost on non-vested awards 9,434  
Weighted average period of recognition of unrecognized compensation cost on non-vested awards 2 years  
Fair value assumptions [Abstract]    
Expected volatility (in hundredths) 26.60% 29.50%
Dividend yield (in hundredths) 1.10% 1.20%
Average risk free interest rate (in hundredths) 1.40% 0.60%
Average expected term 2 years 2 years
Stock Options [Member]
    
Share-based compensation, aggregate disclosures [Abstract]    
Exercisable rights Outstanding stock options generally vest 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.  
Stock option activity [Roll Forward]    
Outstanding, beginning of period (in shares) 744,824  
Granted (in shares) 0  
Exercised (in shares) (57,983)  
Expired or forfeited (in shares) (15,833)  
Outstanding, end of period (in shares) 671,008  
Exercisable (in shares) 354,420  
Outstanding, weighted-average exercise price, beginning of period (in dollars per share) $ 37.76  
Granted, weighted-average exercise price (in dollars per share) $ 0  
Exercised, weighted-average exercise price (in dollars per share) $ 31.99  
Expired or forfeited, weighted-average exercise price (in dollars per share) $ 39.18  
Outstanding, weighted-average exercise price, end of period (in dollars per share) $ 38.22  
Exercisable, weighted-average exercise price (in dollars per share) $ 37.76  
Outstanding, weighted-average remaining contractual term 2 years  
Outstanding, aggregate intrinsic value 2,944  
Exercisable, weighted-average remaining contractual term 1 year 10 months 24 days  
Exercisable, aggregate intrinsic value 1,718  
Intrinsic value of options exercised 488 182
Non-vested options activity [Roll Forward]    
Non-vested at beginning of period (in shares) 331,755  
Granted (in shares) 0  
Vested (in shares) 0  
Expired or forfeited (in shares) (15,167)  
Non-vested at end of period (in shares) 316,588  
Non-vested, weighted-average grant-date fair value, beginning of period (in dollars per share) $ 11.29  
Granted, weighted-average grant-date fair value (in dollars per share) $ 0  
Vested, weighted-average grant-date fair value (in dollars per share) $ 0  
Expired or forfeited, weighted-average grant-date fair value (in dollars per share) $ 12.25  
Non-vested, weighted-average grant-date fair value, end of period (in dollars per share) $ 11.24  
Director Fee Plan [Member]
    
Share-based compensation, aggregate disclosures [Abstract]    
Shares reserved for future issuance under award plan (in shares) 300,000  
Director Fee Plan, aggregate disclosures [Abstract]    
Annual retainer fee paid to non-employee directors 60  
Annual retainer fee paid to non-employee Chairman of the Board 130  
Shares deferred under the Director Fee Plan (in shares) 17,005  
Value of annual stock based grant $ 100  
Total stock options granted to date (in shares) 22,300  
Option awards outstanding and vested (in shares) 11,800  
Total restricted stock awards granted to date (in shares) 103,150  
Restricted stock awards unvested (in shares) 38,227