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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Reconciliation of Changes in the Fair Value of Financial Assets and Liabilities Classified as Level 3 (Details) - Level 3 - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Reconciliation of changes in the fair value of our financial assets and liabilities |  |  |  |
Net liabilities at beginning of period | $ 8,973 | $ 19,873 | $ 9,123 | $ 18,373
Additions | 0 | 0 | 0 | 1,500
Total gains or losses included in earnings | 0 | (3,800) | 100 | (3,800)
Settlements | 0 | (4,250) | (250) | (4,250)
Net liabilities at end of period | $ 8,973 | $ 11,823 | $ 8,973 | $ 11,823

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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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