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Share-Based Compensation - Schedule of Restricted Share Activity (Detail) - Restricted Stock [Member] - $ / shares	9 Months Ended	12 Months Ended
	Jun. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Unvested, Beginning Balance	975,415	736,891	1,172,493	1,006,206
Number of Shares, Granted	550,247	738,998	495,087	718,959
Number of Shares, Vested	(532,397)	(448,726)	(585,755)	(455,303)
Number of Shares, Forfeited	(29,575)	(51,748)	(344,934)	(97,369)
Number of Shares, Unvested, Ending Balance	963,690	975,415	736,891	1,172,493
Weighted-Average Grant Date Fair Value, Unvested, Beginning Balance	$ 1.83	$ 3.35	$ 4.43	$ 6.22
Weighted-Average Grant Date Fair Value, Granted	1.04	1.55	2.43	3.2
Weighted-Average Grant Date Fair Value, Vested	1.92	3.82	4.58	6.13
Weighted-Average Grant Date Fair Value, Forfeited	1.88	2.21	4.05	2.97
Weighted-Average Grant Date Fair Value, Unvested, Ending Balance	$ 1.32	$ 1.83	$ 3.35	$ 4.43

X

- Definition

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

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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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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).

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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).

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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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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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