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NON-EMPLOYEE SHARE-BASED AND OTHER COMPENSATION (Details) (USD $)
12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Stock-based compensation plans [Abstract]   
Number of fixed stock option plans3  
Independent Contractor Financial Advisors [Member] | Non-Qualified Stock Option Plan [Member]
   
Stock-based compensation plans [Abstract]   
Number of fixed stock option plans1  
Number of shares authorized for grant (in shares)2,000,000  
Exercisable period after grant date for options granted before August 21, 2008 (in years)5Y  
Exercisable period after grant date for options granted on or after August 21, 2008 (in years)5Y  
Period of termination within which options are exercisable (in days)45D  
Expiration date of awardSixth anniversary of the grant date  
Expense and income tax benefits [Abstract]   
Total share-based expense (expense reduction)$ 952,000$ 1,899,000$ (5,291,000)
Income tax benefits related to share-based expense362,000713,000(1,987,000)
Weighted-average assumptions [Abstract]   
Dividend yield (in hundredths)1.62%1.73%2.34%
Expected volatility (in hundredths)44.14%51.84%44.44%
Risk-free interest rate (in hundredths)0.65%0.88%1.04%
Expected lives (in years)2.542.242.20
Average exercise period of options (in days)90D90D90D
Summary of option activity [Roll Forward]   
Outstanding - beginning of period (in shares)790,438  
Granted (in shares)40,900  
Exercised (in shares)(343,388)  
Forfeited (in shares)(10,950)  
Expired (in shares)(2,250)  
Outstanding - end of period (in shares)474,750790,438 
Option activity, additional disclosures [Abstract]   
Weighted average exercise price, outstanding - beginning of period (in dollars per share)$ 26.07  
Weighted average exercise price, granted (in dollars per share)$ 28.74  
Weighted average exercise price, exercised (in dollars per share)$ 21.62  
Weighted average exercise price, forfeited (in dollars per share)$ 30.29  
Weighted average exercise price, expired (in dollars per share)$ 22.87  
Weighted average exercise price, outstanding - end of period (in dollars per share)$ 29.45$ 26.07 
Weighted-average remaining contractual term (in years)2.06  
Aggregate intrinsic value383,000  
Exercisable, outstanding (in shares)4,500  
Exercisable, weighted average exercise price (in dollars per share)$ 21.50  
Exercisable, weighted average remaining contractual term (in years)0.01  
Exercisable, aggregate intrinsic value20,000  
Total intrinsic value of stock options exercised3,300,0002,676,0001,241,000
Total fair value of stock options vested1,448,00001,694,000
Cash received from stock option exercises7,400,000  
Excess benefits realized during the period as a result of the exercise of options0  
Unrecognized pre-tax expense [Abstract]   
Unrecognized pre-tax expense417,000  
Weighted-average reporting date fair value of unvested options (in dollars per share)$ 3.99  
Weighted-average period of recognition (in years)2.9  
Independent Contractor Financial Advisors [Member] | 2005 Restricted Stock Plan [Member]
   
Stock-based compensation plans [Abstract]   
Restricted period of awards (in years)5Y  
Expense and income tax benefits [Abstract]   
Total share-based expense (expense reduction)923,000858,000378,000
Income tax benefits related to share-based expense351,000322,000142,000
Summary of equity instruments other than options, activity [Roll forward]   
Nonvested - beginning of period (in shares)156,380  
Granted (in shares)0  
Vested (in shares)(1,550)  
Forfeited (in shares)(2,500)  
Nonvested - end of period (in shares)152,330156,380 
Equity instruments other than options, additional disclosures [Abstract]   
Weighted average reporting date fair value, nonvested - beginning of period (in dollars per share)$ 25.33  
Weighted average reporting date fair value, nonvested - end of period (in dollars per share)$ 25.96$ 25.33 
Weighted-average fair value of shares vested (in dollars per share)$ 31.91  
Weighted-average fair value of shares forfeited (in dollars per share)$ 29.98  
Unrecognized pre-tax expense [Abstract]   
Unrecognized pre-tax expense1,100,000  
Weighted-average reporting date fair value of unvested restricted stock (in dollars per share)$ 25.96$ 25.33 
Weighted-average period of recognition (in years)1.97  
Total fair value of shares vested under the plan$ 49,000$ 317,000$ 58,400