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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Level 3 Reconciliation (Details) - (Level 3) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reconciliation of changes in the fair value of our financial assets and liabilities |  |  |  |
Net liabilities at beginning of period | $ 9,015 | $ 15,702 | $ 11,160 | $ 14,879
Additions | 0 | 0 | 673 | 0
Included in earnings | 540 | (175) | (2,278) | 5,148
Settlements | 0 | (6,125) | 0 | (10,625)
Net liabilities at end of period | $ 9,555 | $ 9,402 | $ 9,555 | $ 9,402

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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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