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Note 12 - Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Balance | $ 1,767,847 | $ 2,534,107 | $ 3,363,386
Balance | 1,726,986 | 1,767,847 | 2,534,107
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |
Balance | (34,170) | (88,448) | (165,694)
Other comprehensive income (loss) before reclassifications | 21,252 | 54,278 | 77,246
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0
Balance | (12,918) | (34,170) | (88,448)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] |  |  |
Balance | (263) | (5,135) | (10,909)
Other comprehensive income (loss) before reclassifications | 438 | 4,872 | 5,774
Amounts reclassified from accumulated other comprehensive income (loss) | 38 | 0 | 0
Balance | 213 | (263) | (5,135)
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] |  |  |
Balance | 21,468 | 31,487 | 93,020
Other comprehensive income (loss) before reclassifications | (30,197) | (10,019) | (61,533)
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0
Balance | (8,729) | 21,468 | 31,487
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
Balance | (499) | (330) | (333)
Other comprehensive income (loss) before reclassifications | (313) | (245) | (104)
Amounts reclassified from accumulated other comprehensive income (loss) | 33 | 76 | 107
Balance | (779) | (499) | (330)
AOCI Attributable to Parent [Member] |  |  |
Balance | (13,464) | (62,426) | (83,916)
Other comprehensive income (loss) before reclassifications | (8,820) | 48,886 | 21,383
Amounts reclassified from accumulated other comprehensive income (loss) | 71 | 76 | 107
Balance | $ (22,213) | $ (13,464) | $ (62,426)

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