Note 9 - Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Balance	$ 1,768,967	$ 2,534,500
Balance	1,718,966	2,443,664
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(34,170)	(88,448)
Other comprehensive income (loss) before reclassifications	(47,298)	46,494
Amounts reclassified from accumulated other comprehensive loss	0	0
Balance	(81,468)	(41,954)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	(263)	(5,135)
Other comprehensive income (loss) before reclassifications	163	2,524
Amounts reclassified from accumulated other comprehensive loss	0	0
Balance	(100)	(2,611)
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member]
Balance	21,468	31,487
Other comprehensive income (loss) before reclassifications	5,412	(13,368)
Amounts reclassified from accumulated other comprehensive loss	0	0
Balance	26,880	18,119
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(499)	(330)
Other comprehensive income (loss) before reclassifications	(68)	(35)
Amounts reclassified from accumulated other comprehensive loss	18	27
Balance	(549)	(338)
AOCI Attributable to Parent [Member]
Balance	(13,464)	(62,426)
Other comprehensive income (loss) before reclassifications	(41,791)	35,615
Amounts reclassified from accumulated other comprehensive loss	18	27
Balance	$ (55,237)	$ (26,784)