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Segment Information - Concentration of credit risk - Financing receivable (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Financing receivables, net	$ 6,391	$ 7,306
Customer A | Financing Receivables | Credit Concentration Risk
Segment Reporting Information [Line Items]
Financing receivables, net	$ 1,500	$ 3,000
Concentration risk percentage	23.00%	41.00%
Customer B | Financing Receivables | Credit Concentration Risk
Segment Reporting Information [Line Items]
Financing receivables, net	$ 1,900	$ 1,900
Concentration risk percentage	30.00%	25.00%
Customer C | Financing Receivables | Credit Concentration Risk
Segment Reporting Information [Line Items]
Financing receivables, net	$ 300	$ 1,300
Concentration risk percentage	4.00%	18.00%
Customer D | Financing Receivables | Credit Concentration Risk
Segment Reporting Information [Line Items]
Financing receivables, net	$ 1,100
Concentration risk percentage	17.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

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- Definition

Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
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-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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