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RESTRUCTURING CHARGES - Schedule of Accrued Liability for the Restructuring and Related Charges (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2024
Restructuring Reserve [Roll Forward] |  |  |  |  |
Accrued liability beginning balance | $ 6,925 | $ 12,998 | $ 12,999 | $ 19,658 | $ 19,658
Restructuring charges |  |  | 2,401 | 12,400 | 14,801
Cash payment | (1,732) | (6,073) | (2,527) | (10,577) |
Non-cash charges |  |  |  | (8,482) |
Accrued liability ending balance | 5,193 | 6,925 | 12,873 | 12,999 | 12,873
Personnel related costs |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Accrued liability beginning balance | 3,173 | 8,182 | 8,739 | 14,107 | 14,107
Restructuring charges |  |  | 482 | 1,847 | 2,329
Cash payment | (83) | (5,009) | (608) | (7,215) |
Non-cash charges |  |  |  | 0 |
Accrued liability ending balance | 3,090 | 3,173 | 8,613 | 8,739 | 8,613
Facilities & Exit Costs |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Accrued liability beginning balance | 3,752 | 4,816 | 4,260 | 5,551 | 5,551
Restructuring charges |  |  | 1,919 | 2,071 | 3,990
Cash payment | (1,649) | (1,064) | (1,919) | (3,362) |
Non-cash charges |  |  |  |  |
Accrued liability ending balance | 2,103 | 3,752 | 4,260 | 4,260 | 4,260
Non-cash facility and other |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Accrued liability beginning balance | 0 | 0 | 0 | 0 | 0
Restructuring charges |  |  | 0 | 8,482 |
Cash payment | 0 | 0 | 0 | 0 |
Non-cash charges |  |  |  | (8,482) |
Accrued liability ending balance | $ 0 | $ 0 | $ 0 | $ 0 | $ 0

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482047/420-10-45-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-1 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details
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