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DERIVATIVES AND HEDGING ACTIVITIES - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) contract | Sep. 30, 2022 USD ($) contract | Sep. 30, 2021 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Economic hedge contracts, outstanding | contract |  | 0 | 0 |
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration] |  | Other assets | Other assets |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Other income (deductions), net |
Designated as Hedging Instrument |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Unrealized gain expected to be recognized over the next 12 months |  | $ 3,850 |  |
Not Designated as Hedging Instrument, Economic Hedge |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain from economic hedges |  |  | $ 4,677 |
Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Cash proceeds from cross currency swap | $ 10,474 |  |  |
Derivative, notional amount | $ 175,000 | 175,000 | 125,000 |
Net unrealized gain on derivative |  | 4,006 | 10,699 |
Net unrealized gain on derivative, after tax |  | 2,991 | 7,937 |
Cross-Currency Swaps | Net Investment Hedging | Designated as Hedging Instrument |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, notional amount |  | 81,392 |  |
Net gains (losses) recognized in AOCI (effective portion) |  | (2,065) | 2,782 |
Net investment hedge, gain, after reclassification, tax expense (benefit) |  | 701 | (940) |
Currency translation adjustment gain, recognized as income |  |  |  | $ 5,370
Derivative asset, noncurrent |  | 2,766 | 3,722 |
Currency translation adjustment, tax |  |  |  | $ 1,743
Cross-Currency Swaps | Net Investment Hedging | Designated as Hedging Instrument | Interest Expense |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Currency translation adjustment gain, recognized as income |  | 1,159 | $ 1,645 |
LIBOR-Based Swap | Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Unrecognized gain on derivative |  | 8,084 |  |
Unrecognized gain on derivative, after tax |  | $ 6,041 |  |

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- Definition Amount of after tax unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective. + References No definition available. + Details
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- Definition Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 810 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 19 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481231/810-10-45-19 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 20 -SubTopic 10 -Topic 810 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481231/810-10-45-20 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (c)(3) -SubTopic 10 -Topic 810 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481203/810-10-50-1A + Details
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- Definition The cash inflow for a financial contract that meets the hedge criteria as either a cash flow hedge, fair value hedge, or hedge of a net investment in a foreign operation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 45 -Paragraph 12 -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-12 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 27 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-27 + Details
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