Long-term debt - Components of finance lease expense and other information relating to leases (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024
Long-term debt.
Finance lease cost: Amortization of lease assets	$ 262	$ 343	$ 867	$ 982
Finance lease cost: Interest on lease liabilities	57	69	190	194
Total finance lease cost	$ 319	$ 412	$ 1,057	$ 1,176
Operating leases, weighted average remaining lease term (in years)	3 years 8 months 12 days		3 years 8 months 12 days		4 years 1 month 6 days
Finance leases, weighted average remaining lease term (in years)	2 years 9 months 18 days		2 years 9 months 18 days		2 years 9 months 18 days
Operating leases, weighted average discount rate (in percent)	7.20%		7.20%		7.40%
Finance leases, weighted average discount rate (in percent)	9.00%		9.00%		8.50%

No definition available.

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- Definition

Amount of lease cost recognized by lessee for finance lease contracts.

+ References

No definition available.

+ Details

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- Definition

Amount of interest expense on finance lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
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-Name Accounting Standards Codification
-Section 45
-Paragraph 4
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
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-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

+ Details

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- Definition

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

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+ Details

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- Definition

Weighted average discount rate for finance lease calculated at point in time.

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+ Details

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- Definition

Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Weighted average discount rate for operating lease calculated at point in time.

+ References

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- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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