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Share-Based Compensation - Weighted Average Grant Date Fair Value of Restricted Stock Units (Details) - $ / shares | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Performance-Based Restricted Stock Units |  |  |
Schedule Of Share Based Compensation, Restricted Stock Units Award, Grant Date Fair Value of Units Granted [Line Items] |  |  |
Granted, stock units weighted average grant date fair value (USD per share) | $ 227.11 | $ 242.39 | $ 216.39
Time-Vested Restricted Stock Units |  |  |
Schedule Of Share Based Compensation, Restricted Stock Units Award, Grant Date Fair Value of Units Granted [Line Items] |  |  |
Granted, stock units weighted average grant date fair value (USD per share) | $ 231.58 | $ 239.39 | $ 223.60

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- Definition [Line Items] for Schedule Of Share Based Compensation, Restricted Stock Units Award, Grant Date Fair Value of Units Granted [Table] + References No definition available. + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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