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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)