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