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Stockholders' Equity (Stock Options Vested, or Expected to Vest and Exercisable) (Details) - Stock Options [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Options outstanding, Number of options | 5,302 | 5,574 | 5,339
Options vested and exercisable, Number of options | 3,911 |  |
Options vested and expected to vest, Number of options | 5,250 |  |
Options outstanding, Weighted-Average Exercise Price | $ 77.39 | $ 76.35 | $ 74.40
Options vested and exercisable, Weighted-Average Exercise Price Per Share | 71.50 |  |
Options vested and expected to vest, Weighted-Average Exercise Price Per Share | $ 77.25 |  |
Options outstanding, Weighted-Average Remaining Life in Years | 5 years 6 months |  |
Options vested and exercisable, Weighted-Average Remaining Life in Years | 4 years 7 months 6 days |  |
Options vested and expected to vest, Weighted-Average Remaining Life in Years | 5 years 6 months |  |
Options outstanding, Aggregate Intrinsic Value | $ 220,265 |  |
Options vested and exercisable, Aggregate Intrinsic Value | 185,525 |  |
Options vested and expected to vest, Aggregate Intrinsic Value | $ 218,835 |  |

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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 https://asc.fasb.org/extlink&oid=128089324&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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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