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Stockholders' Equity (Summary of Activity for Stock Option Awards) (Details) - Stock Options [Member] - $ / shares shares in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options, beginning balance | 5,766 | 5,387
Weighted Average Exercise Price Per Share, beginning balance | $ 59.97 | $ 53.73
Options granted, Number of options | 3 | 629
Options granted, Weighted Average Exercise Price Per Share | $ 127.84 | $ 104.91
Options exercised, Number of options | (137) | (363)
Options exercised, Weighted Average Exercise Price Per Share | $ 37.72 | $ 35.05
Options forfeited, Number of options | (9) | (30)
Options forfeited, Weighted Average Exercise Price Per Share | $ 86.77 | $ 83.20
Number of options, ending balance | 5,623 | 5,623
Weighted Average Exercise Price Per Share, ending balance | $ 60.50 | $ 60.50

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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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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