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FINANCIAL STATEMENT COMPONENTS - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024
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AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance |  | $ 3,368,328
Ending balance | $ 3,584,549 |
Accumulated Other Comprehensive Income (Loss) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance |  | (49,075)
Ending balance | (46,386) |
Currency Translation Adjustments |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance |  | (75,846)
Ending balance | (80,016) |
Unrealized Gains (Losses) on Available-for-Sale Securities |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance |  | (3,654)
Ending balance | 2,316 |
Unrealized Gains (Losses) on Derivatives |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance |  | 46,243
Ending balance | 46,557 |
Unrealized Gains (Losses) on Defined Benefit Plans |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance |  | $ (15,818)
Ending balance | $ (15,243) |

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