Note 9 - Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Balance	$ 2,534,500	$ 3,363,386
Balance	1,990,398	2,723,500
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(88,448)	(165,694)
Other comprehensive income (loss) before reclassifications	21,725	113,140
Amounts reclassified from accumulated other comprehensive income (loss)	0
Balance	(66,723)	(52,554)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	(5,135)	(10,909)
Other comprehensive income (loss) before reclassifications	3,799	4,109
Amounts reclassified from accumulated other comprehensive income (loss)	0
Balance	(1,336)	(6,800)
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member]
Balance	31,487	93,020
Other comprehensive income (loss) before reclassifications	(7,971)	(70,478)
Amounts reclassified from accumulated other comprehensive income (loss)	0
Balance	23,516	22,542
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(330)	(333)
Other comprehensive income (loss) before reclassifications	(88)	0
Amounts reclassified from accumulated other comprehensive income (loss)	66
Balance	(352)	(333)
AOCI Attributable to Parent [Member]
Balance	(62,426)	(83,916)
Other comprehensive income (loss) before reclassifications	17,465	46,771
Amounts reclassified from accumulated other comprehensive income (loss)	66
Balance	$ (44,895)	$ (37,145)