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FINANCIAL STATEMENT COMPONENTS - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Sep. 30, 2023
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AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance |  | $ 2,919,753
Ending balance | $ 3,043,711 |
Accumulated Other Comprehensive Income (Loss) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance |  | (36,341)
Ending balance | (32,264) |
Currency Translation Adjustments |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance |  | (64,627)
Ending balance | (68,826) |
Unrealized Gains (Losses) on Available-for-Sale Securities |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance |  | (12,797)
Ending balance | (163) |
Unrealized Gains (Losses) on Derivatives |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance |  | 59,944
Ending balance | 55,739 |
Unrealized Gains (Losses) on Defined Benefit Plans |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance |  | $ (18,861)
Ending balance | $ (19,014) |

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