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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)