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Stock-Based Compensation - Equity Incentive Plan Activity (Detail) - $ / shares shares in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock Options, Total Options, Outstanding at September 30, 2022 | [1] | 1,574 |  |  |
Stock Options, Total Options, Granted | [1] | 157 |  |  |
Stock Options, Total Options, Exercised / Vested | [1] | (75) |  |  |
Stock Options, Total Options, Cancelled / Forfeited | [1] | (15) |  |  |
Stock Options, Total Options, Outstanding at September 30, 2023 | [1] | 1,641 | [2] | 1,574 |
Stock Options, Total Options, Exercisable at September 30, 2023 | [1] | 1,172 |  |  |
Stock Options, Weighted Average Exercise Price, Outstanding at September 30, 2022 |  | $ 49.89 |  |  |
Stock Options, Weighted Average Exercise Price, Granted |  | 73.84 |  |  |
Stock Options, Weighted Average Exercise Price, Exercised / Vested |  | 47.77 |  |  |
Stock Options, Weighted Average Exercise Price, Cancelled / Forfeited |  | 49.88 |  |  |
Stock Options, Weighted Average Exercise Price, Outstanding at September 30, 2023 |  | 52.27 | [2] | $ 49.89 |
Stock Options, Weighted Average Exercise Price, Exercisable at September 30, 2023 |  | $ 50.02 |  |  |
Restricted Stock Units [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Restricted Stock / Units, Outstanding at September 30, 2022 | [3] | 1,012 |  |  |
Restricted Stock / Units, Granted | [3] | 225 |  |  |
Restricted Stock / Units, Performance-based adjustment | [3],[4] | 20 |  |  |
Restricted Stock / Units, Exercised / Vested | [3] | (275) |  |  |
Restricted Stock / Units, Cancelled / Forfeited | [3] | (44) |  |  |
Restricted Stock / Units, Outstanding at September 30, 2023 | [3] | 938 | [2] | 1,012 |
Restricted Stock / Units, Weighted Average Grant Date Fair Value, Outstanding at September 30, 2022 |  | $ 48.95 |  |  |
Restricted Stock / Units, Weighted Average Grant Date Fair Value, Granted |  | 73.68 |  | $ 58.72 | $ 41.92
Restricted Stock / Units, Weighted Average Grant Date Fair Value, Performance-based adjustment | [4] | 51.88 |  |  |
Restricted Stock / Units, Weighted Average Grant Date Fair Value, Exercised / Vested |  | 50.43 |  |  |
Restricted Stock / Units, Weighted Average Grant Date Fair Value, Cancelled / Forfeited |  | 50.2 |  |  |
Restricted Stock / Units, Weighted Average Grant Date Fair Value, Outstanding at September 30, 2023 |  | $ 54.45 | [2] | $ 48.95 |
[1] | Unvested stock options were approximately 469,000 a nd 651,000 at September 30, 2023 and 2022 and their weighted average grant date fair values were $57.92 and $49.30, respectively.
[2] | Stock options outstanding include options vested and expected to vest in the future and have a weighted average remaining contractual life of 6.13 years.
[3] | The number granted represents the number of shares issuable upon vesting of time-based restricted stock units and performance-based restricted stock units, assuming the Company performs at the target performance level in each year of the three-year performance period.
[4] | Represents the net incremental number of shares issuable upon vesting of performance-based restricted stock units based on the Company’s actual financial performance metrics for fiscal 2023.

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of grants made 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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- 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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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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