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Leases - Additional information related to leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 7,318	$ 6,349
Operating cash flows from finance leases	802	861
Financing cash flows from finance leases	1,430	1,351
Right-of-use assets obtained in exchange for operating lease liabilities
Operating leases	$ 16,426	$ 3,028
Weighted-average remaining lease term:
Operating leases	9 years 3 months 18 days	10 years 6 months
Finance leases	9 years 8 months 12 days	10 years 4 months 24 days
Weighted-average discount rate:
Operating leases	4.80%	4.60%
Finance leases	4.70%	4.70%

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