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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 | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Reconciliation of changes in the fair value of our financial assets |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, general and administrative | Selling, general and administrative
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 | Selling, general and administrative
Level 3 |  |
Reconciliation of changes in the fair value of our financial assets |  |
Assets at beginning of period | $ 23,745 | $ 2,865
Purchases | 4,487 | 15,177
Transfers in/(out) | 0 | 3,000
Unrealized gain included in earnings | 0 | 2,703
Assets at end of period | 28,232 | 23,745
Reconciliation of changes in the fair value of our financial liabilities |  |
Liabilities at beginning of period | 4,022 | 2,996
Additions | 500 | 1,500
Total gains or losses included in earnings | 7,808 | (224)
Settlements | (2,875) | (250)
Liabilities at end of period | 9,455 | 4,022
Level 3 | Galileo Technologies |  |
Reconciliation of changes in the fair value of our financial assets |  |
Assets at beginning of period | 33,565 | 500
Purchases | 2,122 | 36,065
Accrued interest | 2,434 | 0
Transfers in/(out) | 0 | (3,000)
Reserves | (681) | 0
Assets at end of period | $ 37,440 | $ 33,565

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Reserves + References No definition available. + Details
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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 Indicates line item in statement in which net income is reported that includes unrealized gain (loss) from asset measured at fair value using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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