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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 | 9 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 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 |  |  | $ 23,700 |
Assets at end of period | $ 26,300 |  | 26,300 |
Reconciliation of changes in the fair value of our financial liabilities |  |  |  |
Liabilities at beginning of period | 5,030 | $ 2,996 | 4,022 | $ 2,996
Additions | 0 | 1,000 | 500 | 1,500
Total gains or losses included in earnings | 4,050 | 0 | 5,808 | (250)
Settlements | (500) | 0 | (1,750) | (250)
Liabilities at end of period | 8,580 | 3,996 | 8,580 | 3,996
Level 3 | Galileo Technologies |  |  |  |
Reconciliation of changes in the fair value of our financial assets |  |  |  |
Assets at beginning of period | 35,140 | 3,500 | 33,565 | 500
Purchases | 41 | 33,024 | 2,116 | 36,024
Accrued interest | 2,001 | 0 | 2,001 | 0
Transfers out | 0 | 0 | (500) | 0
Assets at end of period | $ 37,182 | $ 36,524 | $ 37,182 | $ 36,524

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers In (Out) + 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 -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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