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Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Gross number of share options (or share units) granted during the period.

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STOCKHOLDERS’ EQUITY - Narrative (Details) - USD ($)			3 Months Ended		6 Months Ended
STOCKHOLDERS’ EQUITY - Narrative (Details) - USD ($)	Oct. 01, 2024	Nov. 06, 2018	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2024	May 13, 2024	Oct. 02, 2023	Jan. 31, 2020	Mar. 07, 2018	Mar. 10, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to outstanding stock options and RSUs			$ 36,200,000		$ 36,200,000
Weighted average period for unrecognized compensation expense expected to be recognized (in years)					2 years 7 months 6 days
Purchase of common stock (in shares)			345,883		345,883		461,710
Recognized compensation expense			$ 4,352,000	$ 3,888,000	$ 8,817,000	$ 7,318,000
Options granted (in shares)					0	0
Amount authorized and approved under share repurchase program								$ 50,000,000.0
Amount of shares repurchased			$ 0		$ 3,300,000
Number of shares repurchased (in shares)					363,378
Average price of shares repurchased (in dollars per share)					$ 8.99
Inducement Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common stock (in shares)			217,179		217,179
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense			$ 0	0	$ 0	$ 0
Unrecognized compensation expense related to options outstanding			$ 0		$ 0
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for unrecognized compensation expense expected to be recognized (in years)					2 years 9 months 18 days
Awards outstanding (in shares)			3,006,254		3,006,254		2,453,630
Recognized compensation expense			$ 2,800,000	2,600,000	$ 5,600,000	4,900,000
Unrecognized compensation expense related to nonvested awards			$ 23,200,000		$ 23,200,000
RSUs \| Inducement Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)			202,165		202,165
Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for unrecognized compensation expense expected to be recognized (in years)					2 years 2 months 12 days
Awards outstanding (in shares)			1,796,052		1,796,052		699,458
Recognized compensation expense			$ 1,500,000	1,300,000	$ 2,900,000	2,300,000
Unrecognized compensation expense related to nonvested awards			$ 12,800,000		$ 12,800,000
Performance RSUs \| Inducement Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)			825,508		825,508
Performance RSUs \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by grant date fair value	$ 6,400,000
Performance RSUs \| Chief Executive Officer \| Share-Based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by other than options, grants	562,283
Performance RSUs \| Chief Executive Officer \| Share-Based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by other than options, grants	173,010
Service Based Restricted Stock Units \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by grant date fair value	$ 1,600,000
Service Based Restricted Stock Units \| Chief Executive Officer \| Share-Based Payment Arrangement, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by other than options, grants	187,427
Russell 2000 PSUs \| Chief Executive Officer \| Share-Based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by other than options, grants	185,553
Stock Price PSUs \| Chief Executive Officer \| Share-Based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by other than options, grants	57,093
Performance options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common stock (in shares)			717,363		717,363
Performance options \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock reserved for future grants (in shares)		800,000
Recognized compensation expense			$ 0	0	$ 0	0
Exercise price per share (in dollars per share)		$ 9.50
2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)									5,108,000	9,608,000
Number of common stock reserved for future grants (in shares)			3,316,738		3,316,738
2020 Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)			2,730,966		2,730,966
2020 Plan \| Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)			970,544		970,544
Prior Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)										107,903
Purchase of common stock (in shares)			87,204		87,204
Prior Plans \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)			0		0
ESPP common stock equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)											1,000,000
Number of common stock reserved for future grants (in shares)			87,204		87,204
Issuance of common stock under employee stock purchase plan (in shares)					912,796
Discount rate from market price, offering date					15.00%
Recognized compensation expense			$ 0	$ 0	$ 300,000	$ 0
Director Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)												1,500,000
Number of common stock reserved for future grants (in shares)			0		0
Director Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common stock (in shares)			84,527		84,527