Note 12 - Leases - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Operating cash flows from operating leases	$ 46,188	$ 45,992	$ 45,661
Operating leases (Year)	9 years 3 months 18 days	9 years 10 months 24 days
Finance leases (Year)	15 years 1 month 6 days	13 years 7 months 6 days
Operating cash flows from finance leases	$ 2,192	$ 2,277	2,320
Operating leases	4.20%	4.10%
Financing cash flows from finance leases	$ 3,825	$ 3,610	2,779
Finance leases	5.10%	4.80%
Operating leases	$ 18,412	$ 22,317	15,274
Finance leases	$ 7,419	$ (45)	$ 5,724