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Share-Based Compensation - Schedule Of Outstanding Restricted Share Awards (Details) - $ / shares	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Share-Based Compensation
Outstanding restricted share awards, Nonvested at October 1,	220,758	189,725	265,367
Outstanding restricted share awards, Granted, Shares	104,353	78,016	84,880
Outstanding restricted share awards, Vested, Shares	(98,574)	(34,753)	(119,811)
Outstanding restricted share awards, Cancelled, Shares	(19,259)	(12,230)	(40,711)
Outstanding restricted share awards, Nonvested at September 30,	207,278	220,758	189,725
Outstanding restricted share awards, Nonvested at October 1, Weighted Avg. Price	$ 102.4	$ 94.91	$ 84.29
Outstanding restricted share awards, Granted, Weighted Avg. Price	145.39	108.16	93.64
Outstanding restricted share awards, Vested, Weighted Avg. Price	138.4	96.52	82.28
Outstanding restricted share awards, Cancelled, Weighted Avg. Price	94.24	94.91	85
Outstanding restricted share awards, Nonvested at September 30, Weighted Avg. Price	$ 114.68	$ 102.4	$ 94.91

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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
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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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
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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
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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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