EMPLOYEE BENEFIT PLANS (Details) (USD $)	12 Months Ended				12 Months Ended								12 Months Ended
	Sep. 30, 2011	Sep. 30, 2011 Employee stock ownership plan (ESOP) [Member]	Aug. 31, 2011 Employee stock ownership plan (ESOP) [Member]	Sep. 30, 2010 Employee stock ownership plan (ESOP) [Member]	Sep. 30, 2011 Deferred compensation - Life insurance [Member]	Sep. 30, 2010 Deferred compensation - Life insurance [Member]	Sep. 30, 2009 Deferred compensation - Life insurance [Member]	Sep. 30, 2011 Stock Options [Member] Employees and Directors [Member]	Sep. 30, 2010 Stock Options [Member] Employees and Directors [Member]	Sep. 30, 2009 Stock Options [Member] Employees and Directors [Member]	Sep. 30, 2011 Qualified Stock Option Plan [Member]	Sep. 30, 2011 Non Qualified Stock Option Plan [Member]	Sep. 30, 2011 Non Qualified Stock Option Plan [Member] Outside Directors [Member]	Sep. 30, 2011 Non Qualified Stock Option Plan [Member] Key management personnel [Member]	Sep. 30, 2011 2005 Restricted Stock Plan [Member]	Sep. 30, 2011 2005 Restricted Stock Plan [Member] Employees [Member]	Sep. 30, 2010 2005 Restricted Stock Plan [Member] Employees [Member]	Sep. 30, 2009 2005 Restricted Stock Plan [Member] Employees [Member]	Sep. 30, 2011 Employee Stock Purchase Plan [Member]	Sep. 30, 2010 Employee Stock Purchase Plan [Member]	Sep. 30, 2009 Employee Stock Purchase Plan [Member]	Sep. 30, 2011 2007 Stock Bonus Plan [Member] Employees [Member]	Sep. 30, 2010 2007 Stock Bonus Plan [Member] Employees [Member]	Sep. 30, 2009 2007 Stock Bonus Plan [Member] Employees [Member]
Employee stock ownership plan [Abstract]
Vesting period of benefits in ESOP (in years)		6Y
Number of shares of common stock held by the ESOP		6,279,000		5,982,000
Market value of common stock held by the ESOP		$ 163,000,000
Value of unearned (not yet vested) shares held by ESOP plan participants		2,300,000
Authorized pre-funding to the ESOP plan			7,500,000
401(k) plan [Abstract]
Employer match of first $500 of compensation deferred by each participant (in hundredths)	100.00%
Employee contribution threshold at which employer match is determined	500
Employer match of next $500 of compensation deferred by each participant (in hundredths)	50.00%
Long Term Incentive Plan (LTIP) [Abstract]
Compensation expense					54,100,000	45,400,000	34,800,000
Share-based compensation plans [Abstract]
Number of fixed stock option plans	3										1	2
Number of shares authorized for grant (in shares)											9,000,000		854,298	2,531,250	10,425,000				7,375,000			3,000,000
Number of shares authorized for grant per fiscal year (in shares)															2,000,000							750,000
Exercisable period after grant date for options granted before August 21, 2008											36th to 72nd months
Exercisable period after grant date for options granted on or after August 21, 2008											36th to 72nd months
Period of termination within which options are exercisable (in days)											45D
Vesting period (in years)													3Y
Expiration date of award														Tenth anniversary of the grant date
Restricted period of awards (in years)															5Y							3Y
Expense and income tax benefits [Abstract]
Total share-based expense								7,319,000	8,460,000	6,000,000						19,522,000	20,354,000	18,707,000				10,657,000	8,805,000	10,621,000
Income tax benefits related to share-based expense								319,000	310,000	247,000						7,418,000	7,643,000	7,025,000				4,050,000	3,306,000	3,988,000
Weighted-average assumptions [Abstract]
Dividend yield (in hundredths)								1.80%	1.81%	2.55%
Expected volatility (in hundredths)								43.74%	54.44%	46.99%
Risk-free interest rate (in hundredths)								1.41%	2.57%	1.57%
Expected lives (in years)								4.9	5.0	5.4
Summary of option activity [Roll Forward]
Outstanding - beginning of period (in shares)								4,646,015
Granted (in shares)								262,305
Exercised (in shares)								(1,249,847)
Forfeited (in shares)								(85,226)
Expired (in shares)								(15,411)
Outstanding - end of period (in shares)								3,557,836	4,646,015
Option activity, additional disclosures [Abstract]
Weighted average exercise price, outstanding - beginning of period (in dollars per share)								$ 26.32
Weighted average exercise price, granted (in dollars per share)								$ 28.71
Weighted average exercise price, exercised (in dollars per share)								$ 24.70
Weighted average exercise price, forfeited (in dollars per share)								$ 26.14
Weighted average exercise price, expired (in dollars per share)								$ 28.67
Weighted average exercise price, outstanding - end of period (in dollars per share)								$ 27.06	$ 26.32
Weighted-average remaining contractual term (in years)								2.72
Aggregated intrinsic value								3,344,000
Exercisable, outstanding (in shares)								717,555
Exercisable, weighted average exercise price (in dollars per share)								$ 29.27
Exercisable, weighted average remaining contractual term (in years)								1.25
Exercisable, aggregate intrinsic value								178,000
Weighted-average grant date fair value per option (in dollars per share)								$ 9.62	$ 10.83	$ 6.22
Total intrinsic value of stock options exercised								10,553,000	2,323,000	3,211,000
Total grant date fair value of stock options vested								9,206,000	2,784,000	7,512,000
Cash received from stock option exercises								35,800,000
Excess benefits realized during the period as a result of the exercise of options								250,000
Summary of equity instruments other than options, activity [Roll forward]
Nonvested - beginning of period (in shares)																2,964,063						1,154,387
Granted (in shares)																946,299						407,141
Vested (in shares)																(612,027)						(355,158)
Forfeited (in shares)																(131,193)						(18,038)
Nonvested - end of period (in shares)																3,167,142	2,964,063					1,188,332	1,154,387
Equity instruments other than options, additional disclosures [Abstract]
Weighted-average grant date fair value, nonvested - beginning of period (in dollars per share)																$ 25.58						$ 24.68
Weighted-average grant date fair value, granted (in dollars per share)																$ 30.76						$ 31.53
Weighted-average grant date fair value, vested (in dollars per share)																$ 24.23						$ 33.23
Weighted-average grant date fair value, forfeited (in dollars per share)																$ 25.92						$ 25.42
Weighted-average grant date fair value, nonvested - end of period (in dollars per share)																$ 27.38	$ 25.58					$ 24.46	$ 24.68
Employee stock purchase plan, additional disclosures [Abstract]
Percentage of eligible employees' annual compensation specified to purchase common stock (in hundredths)																			20.00%
Limit on the number shares that eligible employees may purchase in any calendar year (in shares)																			1,000
Limit on the value of shares that eligible employees may purchase in any calendar year																			25,000
Purchase price of the stock in relation to the market price (one day prior to the purchase) (in hundredths)																			85.00%
Number of shares sold during the period (in shares)																			337,000	382,000	532,000
Discount from market value (in hundredths)																			15.00%	15.00%	15.00%
Compensation cost																			1,600,000	1,500,000	1,300,000
Stock bonus plan, additional disclosures [Abstract]
Minimum percentage of annual bonus amounts in excess of $250,000 that an employee can receive in stock awards, in lieu of cash (in hundredths)																						10.00%
Maximum percentage of annual bonus amounts in excess of $250,000 at an employee can receive in stock awards, in lieu of cash (in hundredths)																						50.00%
Bonus amount that must be exceeded in order to receive awards in lieu of cash																						250,000
Unrecognized pre-tax expense [Abstract]
Unrecognized pre-tax expense								12,800,000								42,500,000						8,900,000
Weighted-average period of recognition (in years)								2.89								3.44						1.87
Total fair value of shares vested under the plan																$ 15,000,000						$ 11,800,000
Employee investment funds [Abstract]
Ratio of the purchase price per unit that non-recourse loans were made to key employees who participate in the employee investment funds (in hundredths)	two-thirds