Share-Based Compensation (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Sep. 30, 2011 Installment Year Contract	Sep. 30, 2010	Sep. 30, 2009
Share-based Compensation (Textuals) [Abstract]
Income Tax Benefit Recognized	$ 26,342	$ 28,532	$ 31,307
SARs Vesting Period	4 years
SARs Terms of Award	10 years
Total Intrinsic Value of SARs Exercised	9,185	2,831	406
Stock Issued under SARs Exercised	81,848
Actual tax benefit realized for tax deductions from SAR	3,459	1,031	154
Total fair value of stock appreciation rights	31,992	33,640	24,888
Outstanding stock options term of award	P10Y
Cash received from the exercising of stock options	103,267	72,770	53,019
Actual tax benefit realized for tax deductions from stock option exercises	45,829	28,660	16,931
Total intrinsic value of stock options exercised	137,720	89,943	53,630
Total fair value of stock options vested	0	0	6,083
Stock Units Vesting Period	Three Years
Expected forfeited performance-based restricted stock units	180,182
Percentage of target payout on which performance-based restricted stock units are based	200.00%
Share based compensation arrangement by share based payment award	the actual payout under these awards may vary from zero to 200% of an employee’s target payout, based on the Company’s actual performance over the three-year performance period
Units in excess of the expected performance payout	2,488,737
Unrecognized compensation expense for all non-vested share-based awards	80,744
Weighted-average remaining life non-vested share-based awards	2.09
Shares were authorized for future grants	7,717,344
Distribution of each award is deferred until after retirement or involuntary termination	25% or more
Period over which balance of stock award distributable, (years)	5 years
Outstanding shares under other stock plan.	97,705	106,293
Number of shares reserved for issuance under restricted stock plan for non-employee directors	300,000
Number of restricted shares issued during the period	0
Shares held in trust	97,628
Shares represented Directors compensation in 2010	4,212
Number of equal installments in which deferred portion of stock award is distributable	5
Shares issuable under deferred compensation plan	508,144
Performance-Based Restricted Stock Units [Member]
Share-based Compensation (Textuals) [Abstract]
Granted, stock units weighted average grant date fair value	$ 76.64	$ 75.63	$ 62.50
Total fair value of restricted stock units	15,430	24,357	33,712
Weighted average remaining vesting term	1.08
Time-Vested Restricted Stock Units [Member]
Share-based Compensation (Textuals) [Abstract]
Granted, stock units weighted average grant date fair value	$ 76.97	$ 75.58	$ 62.96
Total fair value of restricted stock units	$ 36,009	$ 36,675	$ 29,535
Weighted average remaining vesting term	1.36
Key Executive Officer [Member]
Share-based Compensation (Textuals) [Abstract]
Stock Units Vesting Period	One Year

Number of shares representing compensation in the current year's period under the Company's Directors' Deferral Plan, which provides a means to defer director compensation, from time to time, on a deferred stock or cash basis.

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Number of equal installments distributed relative to deferred portion of awards under the Company's Stock Award Plan for certain key employees.

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Number of shares reserved for issuance under the Company's Directors' Deferral Plan, which provides a means to defer director compensation, from time to time, on a deferred stock or cash basis.

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Shares outstanding, at the balance sheet date, under the Company's Stock Award Plan (a plan which allows for grants of common shares to certain key employees).

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The range of actual payout, based on the Company's actual performance, that may be realized relative to performance-based restricted stock units.

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Description of the period of time over which an employee's right to exercise an stock appreciation right is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on stock appreciation rights which were exercised during the reporting period under the plan.

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The date when stock appreciation rights expire as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

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Share based compensation tax benefit realized from exercise of stock appreciation rights.

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Share-based Compensation.

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Number of shares held in trust for the Company's Directors' Deferral Plan, which provides a means to defer director compensation, from time to time, on a deferred stock or cash basis.

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Shares issued to satisfy stock appreciation rights exercised during the current year's period.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The date when the equity-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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