Share-Based Compensation (Schedule Of Stock Options Awarded Under The Option Plans) (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
Mar. 31, 2013
Share-Based Compensation [Abstract]
Stock options, Shares, October 1, 2012	125,816
Stock options Granted, Shares
Stock options Exercised, Shares	(50,816)
Stock options Cancelled / Expired, Shares	(5,850)
Stock options, Shares, March 31, 2013	69,150
Stock options Exercisable, Shares	69,150
Stock options Estimated Weighted Average Price, October 1, 2012	$ 36.29
Stock options Granted, Estimated Weighted Average Price
Stock options Exercised, Estimated Weighted Average Price	$ 34.68
Stock options Cancelled / Expired, Estimated Weighted Average Price	$ 37.24
Stock options Estimated Weighted Average Price, March 31, 2013	$ 37.40
Stock options Exercisable, Estimated Weighted Average Price	$ 37.40
Stock options Exercised, Aggregate Intrinsic Value	$ 0.3
Stock options Outstanding at March 31, 2013, Aggregate Intrinsic Value	0.2
Stock options Exercisable at March 31, 2013, Aggregate Intrinsic Value	$ 0.2
Stock options Outstanding at March 31, 2013, Weighted Average Remaining Contractual Life	6 months

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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Number of share options (or share units) exercised during the current period.

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