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Leases - Components of lease costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Leases
Option to extend	true
Finance lease cost
Amortization	$ 1,489	$ 1,510
Interest on lease liabilities	802	861
Operating lease cost	7,810	6,582
Total lease cost	$ 10,101	$ 8,953
Maximum
Leases
Lease term	20 years

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- Definition

Amount of interest expense on finance lease liability.

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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Amount of lease cost recognized by lessee for lease contract.

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Indicates (true false) whether lessee has option to extend operating lease.

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Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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