Stock-Based Compensation (Activity for Stock Option Awards) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2013	Mar. 31, 2013
Stock-Based Compensation
Number of options, beginning balance	4,970	4,556
Weighted Average Exercise Price Per Share, beginning balance	$ 23.94	$ 21.79
Options granted, Number of options	10	690
Options granted, Weighted Average Exercise Price Per Share	$ 38.88	$ 33.71
Options exercised, Number of options	(441)	(693)
Options exercised, Weighted Average Exercise Price Per Share	$ 14.41	$ 13.11
Options forfeited, Number of options	(4)	(18)
Options forfeited, Weighted Average Exercise Price Per Share	$ 30.00	$ 28.61
Number of options, ending balance	4,535	4,535
Weighted Average Exercise Price Per Share, ending balance	$ 24.90	$ 24.90

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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.

+ References

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

+ References

No definition available.

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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 price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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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