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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Reconciliation of Changes in Fair Value of Financial Assets and Liabilities Classified as Level 3 (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022
Reconciliation of changes in the fair value of our financial liabilities |  |  |  |
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Selling, general and administrative |
Level 3 |  |  |  |
Reconciliation of changes in the fair value of our financial assets |  |  |  |
Assets at beginning of period | $ 25,800 | $ 8,881 | $ 23,745 | $ 2,865
Purchases | 501 | 5,109 | 2,556 | 11,125
Assets at end of period | 26,301 | 13,990 | 26,301 | 13,990
Reconciliation of changes in the fair value of our financial liabilities |  |  |  |
Liabilities at beginning of period | 3,780 | 3,096 | 4,022 | 2,996
Additions | 0 | 0 | 500 | 500
Total gains or losses included in earnings | 1,750 | (100) | 1,758 | (250)
Settlements | (500) | 0 | (1,250) | (250)
Liabilities at end of period | 5,030 | 2,996 | 5,030 | 2,996
Level 3 | Galileo Technologies |  |  |  |
Reconciliation of changes in the fair value of our financial assets |  |  |  |
Assets at beginning of period | 33,107 | 3,500 | 33,565 | 500
Purchases | 2,033 | 0 | 2,075 | 3,000
Transfers out | 0 | 0 | (500) | 0
Assets at end of period | $ 35,140 | $ 3,500 | $ 35,140 | $ 3,500

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of purchases of financial instrument classified as an asset 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 https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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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 https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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