Stockholders' Equity (Activity for Stock Option Awards) (Details) (Stock Options [Member], USD $) In Thousands, except Per Share data	12 Months Ended
Sep. 30, 2011
Stock Options [Member]
Number of options, beginning balance	4,011
Weighted Average Exercise Price Per Share, beginning balance	$ 16.87
Options granted, Number of options	709
Options granted, Weighted Average Exercise Price Per Share	$ 32.10
Options exercised, Number of options	(451)
Options exercised, Weighted Average Exercise Price Per Share	$ 9.75
Options expired unexercised, Number of options	(2)
Options expired unexercised, Weighted Average Exercise Price Per Share	$ 32.73
Options forfeited, Number of options	(39)
Options forfeited, Weighted Average Exercise Price Per Share	$ 26.61
Number of options, ending balance	4,228
Weighted Average Exercise Price Per Share, ending balance	$ 20.12

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 decrease in the number of shares that could be issued attributable to the lapse of rights to exercise previously issued stock options under the terms of the option agreements under the plan during the reporting period.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that lapsed 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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Gross 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 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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Number of share options (or share units) exercised during the current period.

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