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, 2012
Dec. 31, 2011
Share-based compensation, aggregate disclosures [Abstract]    
Total stock-based compensation cost $ 1,379 $ 1,412
Future income tax benefit from compensation expense recognized 538 551
Cash received from stock options exercised 475 28
Tax benefit realized from options exercised 8 3
2007 Equity Incentive Plan [Member]
    
Share-based compensation, aggregate disclosures [Abstract]    
Term of plan (in years) 10 years  
Maximum number of shares available for grants or awards (in shares) 2,200,000  
Shares reserved for future issuance under award plan (in shares) 335,492  
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) 551,389  
Granted (in shares) 227,580  
Vested (in shares) (72,210)  
Expired or forfeited (in shares) (40,591)  
Non-vested at end of period (in shares) 666,168  
Non-vested weighted-average grant-date fair value, beginning of period (in dollars per share) $ 32.56  
Granted, weighted-average grant-date fair value (in dollars per share) $ 24.92  
Vested, weighted-average grant-date fair value (in dollars per share) $ 37.31  
Expired or forfeited, weighted-average grant-date fair value (in dollars per share) $ 30.77  
Non-vested weighted-average grant-date fair value, end of period (in dollars per share) $ 29.55  
Non-vested options activity [Roll Forward]    
Expired or forfeited (in shares) (40,591)  
Unrecognized compensation cost [Abstract]    
Unrecognized compensation cost on non-vested awards 7,451  
Weighted average period of recognition of unrecognized compensation cost on non-vested awards (in years) 1 year 10 months 24 days  
Fair value assumptions [Abstract]    
Expected volatility (in hundredths) 29.50% 30.40%
Dividend yield (in hundredths) 1.20% 1.00%
Average risk free interest rate (in hundredths) 0.60% 0.90%
Average expected term (in years) 2 years 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.  
Restricted stock activity [Roll Forward]    
Expired or forfeited (in shares) (3,168)  
Stock option activity [Roll Forward]    
Outstanding, beginning of period (in shares) 840,282  
Granted (in shares) 0  
Exercised (in shares) (21,440)  
Expired or forfeited (in shares) (9,284)  
Outstanding, end of period (in shares) 809,558  
Exercisable (in shares) 456,854  
Outstanding, weighted-average exercise price, beginning of period (in dollars per share) $ 37.15  
Granted, weighted-average exercise price (in dollars per share) $ 0  
Exercised, weighted-average exercise price (in dollars per share) $ 22.12  
Expired or forfeited, weighted-average exercise price (in dollars per share) $ 34.62  
Outstanding, weighted-average exercise price, end of period (in dollars per share) $ 37.58  
Exercisable, weighted-average exercise price (in dollars per share) $ 36.68  
Outstanding, weighted-average remaining contractual term (in years) 2 years 10 months 24 days  
Outstanding, aggregate intrinsic value 0  
Exercisable, weighted-average remaining contractual term (in years) 2 years 7 months 6 days  
Exercisable, aggregate intrinsic value 0  
Intrinsic value of options exercised 182 7
Non-vested options activity [Roll Forward]    
Non-vested at beginning of period (in shares) 355,872  
Granted (in shares) 0  
Vested (in shares) 0  
Expired or forfeited (in shares) (3,168)  
Non-vested at end of period (in shares) 352,704  
Non-vested, weighted-average grant-date fair value, beginning of period (in dollars per share) $ 11.35  
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) $ 10.91  
Non-vested, weighted-average grant-date fair value, end of period (in dollars per share) $ 11.35  
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) 15,067  
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) 83,046  
Restricted stock awards unvested (in shares) 29,288