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Note 12 - Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Balance | $ 2,534,500 | $ 3,363,386 | $ 1,325,334
Balance | 1,768,967 | 2,534,500 | 3,363,386
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |
Balance | (88,448) | (165,694) | 20,139
Other comprehensive income (loss) before reclassifications | 54,278 | 77,246 | (169,266)
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | (16,567)
Balance | (34,170) | (88,448) | (165,694)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] |  |  |
Balance | (5,135) | (10,909) | (1)
Other comprehensive income (loss) before reclassifications | 4,872 | 5,774 | (10,908)
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0
Balance | (263) | (5,135) | (10,909)
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] |  |  |
Balance | 31,487 | 93,020 | 0
Other comprehensive income (loss) before reclassifications | (10,019) | (61,533) | 93,020
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0
Balance | 21,468 | 31,487 | 93,020
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
Balance | (330) | (333) | (787)
Other comprehensive income (loss) before reclassifications | (245) | (104) | 412
Amounts reclassified from accumulated other comprehensive income (loss) | 76 | 107 | 42
Balance | (499) | (330) | (333)
AOCI Attributable to Parent [Member] |  |  |
Balance | (62,426) | (83,916) | 19,351
Other comprehensive income (loss) before reclassifications | 48,886 | 21,383 | (86,742)
Amounts reclassified from accumulated other comprehensive income (loss) | 76 | 107 | (16,525)
Balance | $ (13,464) | $ (62,426) | $ (83,916)

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