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 9 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Share-based compensation, aggregate disclosures [Abstract]        
Total stock-based compensation cost $ 1,693 $ 1,633 $ 5,301 $ 4,926
Future income tax benefit from compensation expense recognized 660 636 2,067 1,921
Cash received from stock options exercised 1,079 23 1,570 749
Tax benefit realized from options exercised 421 8 612 159
Stock option activity [Roll Forward]        
Fair value of shares earned       3,120
Intrinsic value of options exercised       479
2007 Equity Incentive Plan [Member]
        
Share-based compensation, aggregate disclosures [Abstract]        
Term of plan (in years)     10Y  
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) 1,134,844   1,134,844  
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.)  
Restricted stock activity [Roll Forward]        
Non-vested at beginning of period (in shares)     437,442  
Granted (in shares)     199,960  
Vested (in shares)     (58,030)  
Expired or forfeited (in shares)     (1,173)  
Non-vested at end of period (in shares) 578,199   578,199  
Non-vested weighted-average grant-date fair value, beginning of period (in dollars per share)     $ 36.06  
Granted, weighted-average grant-date fair value (in dollars per share)     $ 30.79  
Vested, weighted-average grant-date fair value (in dollars per share)     $ 38.42  
Expired or forfeited, weighted-average grant-date fair value (in dollars per share) $ 34.72   $ 34.72  
Non-vested weighted-average grant-date fair value, end of period (in dollars per share) $ 34.00   $ 34.00  
Unrecognized compensation cost [Abstract]        
Unrecognized compensation cost on non-vested awards 5,104   5,104  
Weighted average period of recognition of unrecognized compensation cost on non-vested awards (in years)     1.5  
Fair value assumptions [Abstract]        
Expected volatility (in hundredths)     30.00% 30.00%
Dividend yield (in hundredths)     1.00% 0.80%
Average risk free interest rate (in hundredths)     1.20% 2.30%
Average expected term (in years)     2.0 2.2
Stock Options [Member]
        
Share-based compensation, aggregate disclosures [Abstract]        
Vesting 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. In addition, 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.)  
Stock option activity [Roll Forward]        
Outstanding, beginning of period (in shares)     953,326  
Granted (in shares)     0  
Exercised (in shares)     (60,299)  
Expired or forfeited (in shares)     (13,914)  
Outstanding, end of period (in shares) 879,113   879,113  
Outstanding, weighted-average exercise price, beginning of period (in dollars per share)     $ 36.32  
Granted, weighted-average exercise price (in dollars per share) $ 0   $ 0  
Exercised, weighted-average exercise price (in dollars per share) $ 26.03   $ 26.03  
Expired or forfeited, weighted-average exercise price (in dollars per share)     $ 36.77  
Outstanding, weighted-average exercise price, end of period (in dollars per share) $ 37.02   $ 37.02  
Outstanding, weighted-average remaining contractual term (in years) 4.3   4.3  
Outstanding, aggregate intrinsic value 2,770   2,770  
Exercisable (in shares) 518,927   518,927  
Exercisable, weighted-average exercise price (in dollars per share) $ 35.74   $ 35.74  
Exercisable, weighted-average remaining contractual term (in years)     3.9  
Exercisable, aggregate intrinsic value 2,298   2,298  
Fair value of shares earned     0  
Intrinsic value of options exercised     721  
Non-vested options activity [Roll Forward]        
Non-vested at beginning of period (in shares)     366,179  
Granted (in shares)     0  
Vested (in shares)     0  
Expired or forfeited (in shares)     (5,993)  
Non-vested at end of period (in shares)   360,186   360,186
Non-vested, weighted-average grant-date fair value, beginning of period (in dollars per share)     $ 13.54  
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)     $ 11.20  
Non-vested, weighted-average grant-date fair value, end of period (in dollars per share) $ 13.58   $ 13.58  
Unrecognized compensation cost [Abstract]        
Unrecognized compensation cost on non-vested awards 88   88  
Weighted average period of recognition of unrecognized compensation cost on non-vested awards (in years)     0.4  
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) 14,794   14,794  
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) 17,800   17,800  
Total restricted stock awards granted to date (in shares) 64,923   64,923  
Restricted stock awards unvested (in shares) 23,623   23,623