Annual report pursuant to Section 13 and 15(d)

SHARE-BASED PAYMENTS (Details)

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SHARE-BASED PAYMENTS (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Share-based compensation, aggregate disclosures [Abstract]      
Total stock-based compensation cost $ 6,972 $ 6,567 $ 5,822
Future income tax benefit from compensation expense recognized 2,719 2,561 2,270
Cash received from stock options exercised 1,859 1,502 1,206
Tax benefits realized from options exercised 278 264 260
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    
Shares reserved for future issuance under award plan (in shares) 1,122,072    
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. The remaining one-half of the shares vest in one-third increments upon attainment of pre-defined levels of appreciation in the market value of the Company’s Class A Common Stock. Additionally, 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) (92,526)    
Expired or forfeited (in shares) (3,263)    
Non-vested at end of period (in shares) 541,613 437,442  
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) $ 39.02    
Expired or forfeited, weighted-average grant-date fair value (in dollars per share) $ 34.02    
Non-vested weighted-average grant-date fair value, end of period (in dollars per share) $ 33.62 $ 36.06  
Unrecognized compensation cost [Abstract]      
Unrecognized compensation cost on non-vested awards 3,600    
Weighted-average period of recognition of unrecognized compensation cost on non-vested awards (in years) 1.6    
Fair value assumptions [Abstract]      
Expected volatility (in hundredths) 30.00% 30.00% 27.00%
Dividend yield (in hundredths) 1.00% 0.80% 0.60%
Average risk-free interest rate (in hundredths) 1.20% 2.30% 2.40%
Average expected term (in years) 2.0 2.2 2.3
Period prior to the grant date on which dividend yield is based (in months) 12M    
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.    
Stock option activity [Roll forward]      
Outstanding, beginning of period (in shares) 953,326    
Granted (in shares) 0    
Exercised (in shares) (62,865)    
Expired or forfeited (in shares) (17,947)    
Outstanding, end of period (in shares) 872,514 953,326  
Exercisable (in shares) 504,928    
Outstanding, weighted-average exercise price , beginning of period (in dollars per share) $ 36.32    
Granted, weighted-average exercise price (in dollars per share) $ 0    
Exercised, weighted-average exercise price (in dollars per share) $ 26.27    
Expired or forfeited, weighted-average exercise price (in dollars per share) $ 37.44    
Outstanding, weighted-average exercise price, end of period (in dollars per share) $ 37.02 $ 36.32  
Exercisable, weighted-average exercise price (in dollars per share) $ 35.75    
Outstanding, weighted-average remaining contractual term, end of period (in years) 4.0    
Exercisable, weighted-average remaining contractual term (in years) 3.7    
Outstanding, aggregate intrinsic value 0    
Exercisable, aggregate intrinsic value 0    
Fair value of shares earned 0 3,120 2,722
Intrinsic value of options exercised 743 747 753
Non-vested options activity [Roll Forward]      
Non-vested beginning of period (in shares) 377,548    
Granted (in shares) 0    
Vested (in shares) 0    
Expired or forfeited (in shares) (9,962)    
Non-vested end of period (in shares) 367,586 377,548  
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) $ 11.25    
Non-vested weighted-average grant-date fair value, end of period (in dollars per share) $ 11.38 $ 11.38  
Unrecognized compensation cost [Abstract]      
Unrecognized compensation cost on non-vested awards 31    
Weighted-average period of recognition of unrecognized compensation cost on non-vested awards (in years) 0.2    
Director Fee Plan [Member]
      
Share-based compensation, aggregate disclosures [Abstract]      
Maximum number of shares available for grants or awards (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) 14,794    
Value of annual stock-based grant $ 80    
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) 64,923    
Restricted stock awards unvested (in shares) 23,623