Stock-Based Compensation - Restricted Stock Units and Performance Share Units Activity (Details) - $ / shares shares in Thousands	12 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
RSUs
Number of Shares
Outstanding, beginning (in shares)	845	695	548
Granted (in shares)	541	596	377
Adjustment to grant based on achieved attainment level (in shares)	0	0	0
Vested (in shares)	(386)	(325)	(209)
Forfeited (in shares)	(94)	(121)	(21)
Outstanding, ending (in shares)	906	845	695
Weighted Average Grant Date Fair Value per Share
Outstanding, beginning (in dollars per share)	$ 7.33	$ 7.47	$ 6.56
Granted (in dollars per share)	12.19	7.17	8.34
Adjustment to grant based on achieved attainment level (in dollars per share)	0	0	0
Vested (in dollars per share)	7.21	7.31	6.69
Forfeited (in dollars per share)	9.60	7.37	7.21
Outstanding, ending (in dollars per share)	$ 10.04	$ 7.33	$ 7.47
PSUs
Number of Shares
Outstanding, beginning (in shares)	743	716	642
Granted (in shares)	231	475	377
Adjustment to grant based on achieved attainment level (in shares)	184	(304)	(256)
Vested (in shares)	(187)	0	(24)
Forfeited (in shares)	(54)	(144)	(23)
Outstanding, ending (in shares)	917	743	716
Weighted Average Grant Date Fair Value per Share
Outstanding, beginning (in dollars per share)	$ 7.55	$ 7.60	$ 6.97
Granted (in dollars per share)	11.99	7.49	8.75
Adjustment to grant based on achieved attainment level (in dollars per share)	0	0	0
Vested (in dollars per share)	6.35	0	7.73
Forfeited (in dollars per share)	8.17	7.65	7.14
Outstanding, ending (in dollars per share)	$ 9.02	$ 7.55	$ 7.60

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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- Definition

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.

+ 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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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- Definition

The net total number of shares (or other type of equity) under an equity-based award plan, other than a stock option plan, that were granted, vested and forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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- Definition

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

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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.

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- Definition

Change in the weighted average exercise price of options outstanding.

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No definition available.

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