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 6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Share-based compensation, aggregate disclosures [Abstract]        
Total stock-based compensation cost $ 1,319 $ 1,851 $ 2,731 $ 3,608
Future income tax benefit from compensation expense recognized 514 721 1,065 1,407
Cash received from stock options exercised 237 338 265 491
Tax benefit realized from options exercised 19 49 22 100
Restricted stock activity [Roll Forward]        
Non-vested weighted-average grant-date fair value, beginning of period (in dollars per share)     $ 33.62  
Granted, weighted-average grant-date fair value (in dollars per share)     $ 32.07  
Vested, weighted-average grant-date fair value (in dollars per share)     $ 35.52  
Expired or forfeited, weighted-average grant-date fair value (in dollars per share) $ 31.45   $ 31.45  
Non-vested weighted-average grant-date fair value, end of period (in dollars per share) $ 32.67   $ 32.67  
Director Fee Plan, aggregate disclosures [Abstract]        
Value of annual stock-based grant     80  
Total stock options granted to date (in shares) 22,300   22,300  
Option awards outstanding and vested (in shares) 11,800   11,800  
Total restricted stock awards granted to date (in shares) 83,046   83,046  
Restricted stock awards unvested (in shares) 29,288   29,288  
2007 Equity Incentive Plan [Member]
        
Share-based compensation, aggregate disclosures [Abstract]        
Term of plan (in years) 10      
Maximum number of shares available for grants or awards (in shares) 2,200,000   2,200,000  
Shares reserved for future issuance under award plan (in shares) 813,152   813,152  
Restricted Stock [Member]
        
Share-based compensation, aggregate disclosures [Abstract]        
Vesting rights     With respect to outstanding restricted share grants, generally one-half of the shares vest on the third anniversary of the grant. For shares granted prior to fiscal 2011, the remaining one-half of the shares vest in one-third increments upon attainment of 10%, 25% and 40% appreciation in the market value of the Company's Class A Common Stock. For shares granted in fiscal 2011, the remaining one-half of the shares vest in one-third increments upon attainment of 5%, 15% and 25% appreciation in the market value of the Company's Class A Common Stock. Additionally, beginning in fiscal 2009, restricted shares cannot vest until the first anniversary of the grant date.  
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)     541,613  
Granted (in shares)     155,710  
Vested (in shares)     (148,003)  
Expired or forfeited (in shares)     (400)  
Non-vested at end of period (in shares) 548,920   548,920  
Non-vested options activity [Roll Forward]        
Expired or forfeited (in shares)     (400)  
Unrecognized compensation cost [Abstract]        
Unrecognized compensation cost on non-vested awards 5,698   5,698  
Weighted average period of recognition of unrecognized compensation cost on non-vested awards (in years)     1.7  
Fair value assumptions [Abstract]        
Expected volatility (in hundredths)     30.40% 30.00%
Dividend yield (in hundredths)     1.00% 1.00%
Average risk free interest rate (in hundredths)     0.90% 1.20%
Weighted average expected term (in years)     2.0 2.0
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 10%, 33% and 60% 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).  
Restricted stock activity [Roll Forward]        
Expired or forfeited (in shares)     (7,233)  
Stock option activity [Roll Forward]        
Outstanding, beginning of period (in shares)     872,514  
Granted (in shares)     0  
Exercised (in shares)     (10,332)  
Expired or forfeited (in shares)     (8,500)  
Outstanding, end of period (in shares) 853,682   853,682  
Exercisable (in shares) 493,329   493,329  
Outstanding, weighted-average exercise price, beginning of period (in dollars per share)     $ 37.02  
Granted, weighted-average exercise price (in dollars per share) $ 0   $ 0  
Exercised, weighted-average exercise price (in dollars per share) $ 25.64   $ 25.64  
Expired or forfeited, weighted-average exercise price (in dollars per share)     $ 40.27  
Outstanding, weighted-average exercise price, end of period (in dollars per share) $ 37.13   $ 37.13  
Exercisable, weighted-average exercise price (in dollars per share) $ 35.96   $ 35.96  
Outstanding, weighted-average remaining contractual term (in years) 3.5   3.5  
Outstanding, aggregate intrinsic value 0   0  
Exercisable, weighted-average remaining contractual term (in years)     3.2  
Exercisable, aggregate intrinsic value 0   0  
Intrinsic value of options exercised     57 288
Non-vested options activity [Roll Forward]        
Non-vested at beginning of period (in shares)     367,586  
Granted (in shares)     0  
Vested (in shares)     0  
Expired or forfeited (in shares)     (7,233)  
Non-vested at end of period (in shares) 360,353   360,353  
Non-vested, weighted-average grant-date fair value, beginning of period (in dollars per share)     $ 11.38  
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)     $ 12.28  
Non-vested, weighted-average grant-date fair value, end of period (in dollars per share) $ 11.36   $ 11.36  
Director Fee Plan [Member]
        
Share-based compensation, aggregate disclosures [Abstract]        
Maximum number of shares available for grants or awards (in shares) 300,000   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) 16,979   16,979