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Stockholders' Equity (Activity for Stock Option Awards) (Details) - $ / shares shares in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Stock-Based Compensation
Number of options, beginning balance	5,880	5,236
Weighted Average Exercise Price Per Share, beginning balance	$ 44.62	$ 39.58
Options granted, Number of options		750
Options granted, Weighted Average Exercise Price Per Share		$ 78.91
Options exercised, Number of options	(158)	(255)
Options exercised, Weighted Average Exercise Price Per Share	$ 22.32	$ 27.81
Options forfeited, Number of options	(15)	(24)
Options forfeited, Weighted Average Exercise Price Per Share	$ 59.97	$ 58.27
Number of options, ending balance	5,707	5,707
Weighted Average Exercise Price Per Share, ending balance	$ 45.20	$ 45.20

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-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 per share amount at which grantees can acquire shares of common stock by exercise of options.

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