Annual report pursuant to Section 13 and 15(d)

SHARE-BASED PAYMENTS (Details)

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SHARE-BASED PAYMENTS (Details) - USD ($)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Share-based compensation, aggregate disclosures [Abstract]      
Total stock-based compensation cost $ 6,812,000 $ 5,562,000 $ 5,472,000
Future income tax benefit from compensation expense recognized 2,657,000 2,169,000 2,134,000
Cash received from stock options exercised 7,951,000 974,000 267,000
Tax benefit realized from options exercised $ 698,000 $ 99,000 $ 22,000
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) 2,500,000    
Shares reserved for future issuance under award plan (in shares) 1,907,538    
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) 296,231    
Vested (in shares) (285,063)    
Expired or forfeited (in shares) (77,417)    
Non-vested at end of period (in shares) 575,150 641,399  
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) 38.23    
Vested, weighted-average grant-date fair value (in dollars per share) 29.39    
Expired or forfeited, weighted-average grant-date fair value (in dollars per share) 30.84    
Non-vested weighted-average grant-date fair value, end of period (in dollars per share) $ 33.83 $ 29.46  
Unrecognized compensation cost [Abstract]      
Unrecognized compensation cost on non-vested awards $ 8,114,000    
Weighted average period of recognition of unrecognized compensation cost on non-vested awards (in years) 2 years    
Non-vested options activity [Roll Forward]      
Expired or forfeited (in shares) (77,417)    
Fair value assumptions [Abstract]      
Expected volatility (in hundredths) 26.60% 29.50% 30.40%
Dividend yield (in hundredths) 1.10% 1.20% 1.00%
Average risk free interest rate (in hundredths) 1.40% 0.60% 0.90%
Weighted average expected term (in years) 2 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) (19,313)    
Stock option activity [Roll Forward]      
Outstanding, beginning of period (in shares) 744,824    
Granted (in shares) 0    
Exercised (in shares) (211,956)    
Expired or forfeited (in shares) (20,546)    
Outstanding, end of period (in shares) 512,322 744,824  
Exercisable (in shares) 199,880    
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) 35.54    
Expired or forfeited, weighted-average exercise price (in dollars per share) 39.08    
Outstanding, weighted-average exercise price, end of period (in dollars per share) 38.62 $ 37.76  
Exercisable, weighted-average exercise price (in dollars per share) $ 38.43    
Outstanding, weighted-average remaining contractual term (in years) 1 year 4 months 24 days    
Outstanding, aggregate intrinsic value $ 2,699    
Exercisable, weighted-average remaining contractual term (in years) 1 year 4 months 24 days    
Exercisable, aggregate intrinsic value $ 1,091    
Intrinsic value of options exercised $ 1,653,000 $ 294,000 $ 57,000
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) (19,313)    
Non-vested at end of period (in shares) 312,442 331,755  
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) 12.65    
Non-vested weighted-average grant-date fair value, end of period (in dollars per share) $ 11.21 $ 11.29  
Director Fee Plan [Member]      
Share-based compensation, aggregate disclosures [Abstract]      
Shares reserved for future issuance under award plan (in shares) 150,000    
Director Fee Plan, aggregate disclosures [Abstract]      
Annual retainer fee paid to non-employee directors $ 60,000    
Annual retainer fee paid to non-employee Chairman of the Board $ 130,000    
Shares deferred under the Director Fee Plan (in shares) 17,005    
Value of annual stock-based grant $ 100,000    
Total stock options granted to date (in shares) 22,300    
Option awards outstanding and vested (in shares) 0    
Total restricted stock awards granted to date (in shares) 120,503    
Restricted stock awards unvested (in shares) 37,457