Share-Based Compensation (Stock Option Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Dec. 31, 2011 years
Share-Based Compensation [Abstract]
Number of Options Outstanding at September 30, 2011	1,480
Wtd. Avg. Exercise Price, Outstanding at September 30, 2011	$ 25.44
Wtd. Avg. Remaining Contractual Life (Years), Outstanding at September 30, 2011	6.1
Aggregate Intrinsic Value, Outstanding at September 30, 2011	$ 13,198
Number of Options, Granted	320
Wtd. Avg. Exercise Price, Granted	$ 41.60
Number of Options, Exercised	(4)
Wtd. Avg. Exercise Price, Exercised	$ 19.56
Aggregate Intrinsic Value , Exercised	87
Number of Options, Forfeited	(6)
Wtd. Avg. Exercise Price, Forfeited	$ 38.57
Number of Options Outstanding at December 31, 2011	1,790
Wtd. Avg. Exercise Price, Outstanding at December 31, 2011	$ 28.30
Wtd. Avg. Remaining Contractual Life (Years), Outstanding at December 31, 2011	6.5
Aggregate Intrinsic Value, Outstanding at December 31, 2011	20,563
Number of Options, Exercisable at December 31, 2011	1,138
Wtd. Avg. Exercise Price, Exercisable at December 31, 2011	$ 22.79
Wtd. Avg. Remaining Contractual Life (Years), Exercisable at December 31, 2011	5.0
Aggregate Intrinsic Value, Exercisable at December 31, 2011	$ 19,532

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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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 weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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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 weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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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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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

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

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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 stock options awarded under the plan during the reporting period.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

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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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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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