Long-term debt and lease liabilities - Future payments pursuant to lease liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Operating
2026	$ 6,548
2027	5,028
2028	3,395
2029	2,345
2030	983
Thereafter	778
Gross lease payments	19,077
Less amounts relating to interest	(2,307)
Lease liabilities	$ 16,770	$ 15,840	$ 16,236
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Lease Liability, Current, Lease Liability Noncurrent	Lease Liability, Current, Lease Liability Noncurrent	Lease Liability, Current, Lease Liability Noncurrent
Finance
2026	$ 1,531
2027	1,054
2028	723
2029	222
2030	42
Gross lease payments	3,572
Less amounts relating to interest	(400)
Lease liabilities	$ 3,172	$ 3,310	$ 2,914
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Lease Liability, Current, Lease Liability Noncurrent	Lease Liability, Current, Lease Liability Noncurrent	Lease Liability, Current, Lease Liability Noncurrent
Total
2026	$ 8,079
2027	6,082
2028	4,118
2029	2,567
2030	1,025
Thereafter	778
Gross lease payments	22,649
Less amounts relating to interest	(2,707)
Lease liabilities	$ 19,942	$ 19,150	$ 19,150

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