STOCKHOLDERS’ EQUITY - RSU Activity (Details) - RSUs - $ / shares	12 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Number of Shares
Beginning balance (in shares)	2,441,677	2,411,267	2,661,943
Granted (in shares)	1,101,925	1,272,917	887,049
Settled (in shares)	(665,635)	(898,178)	(975,764)
Canceled (in shares)	(689,671)	(344,329)	(161,961)
Ending balance (in shares)	2,188,296	2,441,677	2,411,267
Weighted- Average Fair Value Per Share
Beginning balance (in dollars per share)	$ 12.29	$ 9.99	$ 7.95
Granted (in dollars per share)	10.24	14.43	13.35
Settled (in dollars per share)	11.33	9.57	7.64
Canceled (in dollars per share)	12.49	11.16	8.94
Ending balance (in dollars per share)	$ 11.49	$ 12.29	$ 9.99

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 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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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Name Accounting Standards Codification
-Section 50
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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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- Definition

Number of non-option equity instruments exercised by participants.

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Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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Net number of non-option equity instruments granted to participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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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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