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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, 2022 | Sep. 30, 2021
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 |
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 | $ 2,865 | $ 0
Purchases | 15,177 | 2,865
Transfers out | 3,000 | 0
Unrealized gain included in earnings | 2,703 | 0
Assets at end of period | 23,745 | 2,865
Reconciliation of changes in the fair value of our financial liabilities |  |
Liabilities at beginning of period | 2,996 | 9,123
Additions | 1,500 | 0
Total gains or losses included in earnings | (224) | 1,123
Settlements | (250) | (7,250)
Liabilities at end of period | 4,022 | 2,996
Level 3 | Galileo Technologies |  |
Reconciliation of changes in the fair value of our financial assets |  |
Assets at beginning of period | 500 | 500
Purchases | 36,065 | 0
Transfers out | (3,000) | 0
Assets at end of period | $ 33,565 | $ 500

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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