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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 | 9 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Reconciliation of changes in the fair value of our financial assets and liabilities |  |  |  |
Net liabilities | $ 11,823 | $ 9,015 | $ 18,373 | $ 11,160
Additions | 0 | 0 | 1,500 | 673
Total gains or losses included in earnings | 900 | 540 | (2,900) | (2,278)
Settlements | 0 | 0 | (4,250) | 0
Net liabilities | $ 12,723 | $ 9,555 | $ 12,723 | $ 9,555

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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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