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Concentration of major customers and suppliers (Details) - item	6 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Total sales | Customer concentration risk | Major Customers
Major Customers And Suppliers [Line Items]
Number of customers	1	1
Total sales | Customer concentration risk | Major customer one
Major Customers And Suppliers [Line Items]
Concentration risk, percentage	39.00%	79.00%
Accounts receivable | Customer concentration risk | Major Customers
Major Customers And Suppliers [Line Items]
Number of customers	1
Accounts receivable | Customer concentration risk | Major customer one
Major Customers And Suppliers [Line Items]
Concentration risk, percentage	86.00%		75.00%
Accounts receivable | Customer concentration risk | Major customer two
Major Customers And Suppliers [Line Items]
Number of customers			2
Concentration risk, percentage			18.00%
Advances to suppliers | Supplier concentration risk | Major Suppliers
Major Customers And Suppliers [Line Items]
Number of customers	4		4
Advances to suppliers | Supplier concentration risk | Major supplier one
Major Customers And Suppliers [Line Items]
Concentration risk, percentage	40.00%		32.00%
Advances to suppliers | Supplier concentration risk | Major supplier two
Major Customers And Suppliers [Line Items]
Concentration risk, percentage	31.00%		28.00%
Advances to suppliers | Supplier concentration risk | Major supplier three
Major Customers And Suppliers [Line Items]
Concentration risk, percentage	18.00%		24.00%
Advances to suppliers | Supplier concentration risk | Major supplier four
Major Customers And Suppliers [Line Items]
Concentration risk, percentage	11.00%		16.00%
Total purchases | Supplier concentration risk | Major Suppliers
Major Customers And Suppliers [Line Items]
Number of customers	3	3
Total purchases | Supplier concentration risk | Major supplier one
Major Customers And Suppliers [Line Items]
Concentration risk, percentage	33.00%	53.00%
Total purchases | Supplier concentration risk | Major supplier two
Major Customers And Suppliers [Line Items]
Concentration risk, percentage	15.00%	26.00%
Total purchases | Supplier concentration risk | Major supplier three
Major Customers And Suppliers [Line Items]
Concentration risk, percentage	12.00%	15.00%

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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.

+ References

No definition available.

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- Definition

Number of customers.

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- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
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