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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, 2012	Mar. 31, 2012
Stock-Based Compensation
Number of options, beginning balance	4,858	4,228
Weighted Average Exercise Price Per Share, beginning balance	$ 21.34	$ 20.12
Options granted, Number of options	20	845
Options granted, Weighted Average Exercise Price Per Share	$ 43.27	$ 26.00
Options exercised, Number of options	(205)	(390)
Options exercised, Weighted Average Exercise Price Per Share	$ 13.90	$ 12.86
Options forfeited, Number of options		(10)
Options forfeited, Weighted Average Exercise Price Per Share		$ 26.83
Number of options, ending balance	4,673	4,673
Weighted Average Exercise Price Per Share, ending balance	$ 21.76	$ 21.76

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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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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

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Gross number of share options (or share units) granted during the 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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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 weighted-average options price for 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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