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Stockholders' Equity (Activity for Stock Option Awards) (Details) - $ / shares shares in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2016
Stock-Based Compensation |  |
Number of options, beginning balance | 5,636 | 4,641
Weighted Average Exercise Price Per Share, beginning balance | $ 33.81 | $ 32.28
Options granted, Number of options | 0 | 1,055
Options granted, Weighted Average Exercise Price Per Share |  | $ 40.26
Options exercised, Number of options | (205) | (254)
Options exercised, Weighted Average Exercise Price Per Share | $ 22.69 | $ 23.29
Options forfeited, Number of options | (2) | (13)
Options forfeited, Weighted Average Exercise Price Per Share | $ 40.26 | $ 42.97
Number of options, ending balance | 5,429 | 5,429
Weighted Average Exercise Price Per Share, ending balance | $ 34.22 | $ 34.22

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- Definition 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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