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Concentration of major customers and suppliers (Details) | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Total sales | Customer concentration risk | Major customer one |  |  |
Major Customers And Suppliers [Line Items] |  |  |
Concentration risk, percentage | 64.00% | 63.00% | 64.00%
Total sales | Customer concentration risk | Major customer two |  |  |
Major Customers And Suppliers [Line Items] |  |  |
Concentration risk, percentage | 14.00% |  |
Accounts receivable | Customer concentration risk | Major Customers |  |  |
Major Customers And Suppliers [Line Items] |  |  |
Concentration risk, percentage |  | 94.00% |
Accounts receivable | Customer concentration risk | Major customer one |  |  |
Major Customers And Suppliers [Line Items] |  |  |
Concentration risk, percentage | 75.00% |  |
Accounts receivable | Customer concentration risk | Major customer two |  |  |
Major Customers And Suppliers [Line Items] |  |  |
Concentration risk, percentage | 18.00% |  |
Advances to suppliers | Supplier concentration risk | Major supplier one |  |  |
Major Customers And Suppliers [Line Items] |  |  |
Concentration risk, percentage | 32.00% | 45.00% |
Advances to suppliers | Supplier concentration risk | Major supplier two |  |  |
Major Customers And Suppliers [Line Items] |  |  |
Concentration risk, percentage | 28.00% | 44.00% |
Advances to suppliers | Supplier concentration risk | Major supplier three |  |  |
Major Customers And Suppliers [Line Items] |  |  |
Concentration risk, percentage | 24.00% |  |
Advances to suppliers | Supplier concentration risk | Major supplier four |  |  |
Major Customers And Suppliers [Line Items] |  |  |
Concentration risk, percentage | 16.00% |  |
Total purchases | Supplier concentration risk | Major supplier one |  |  |
Major Customers And Suppliers [Line Items] |  |  |
Concentration risk, percentage | 37.00% | 39.00% | 40.00%
Total purchases | Supplier concentration risk | Major supplier two |  |  |
Major Customers And Suppliers [Line Items] |  |  |
Concentration risk, percentage | 20.00% | 41.00% | 50.00%
Total purchases | Supplier concentration risk | Major supplier three |  |  |
Major Customers And Suppliers [Line Items] |  |  |
Concentration risk, percentage | 18.00% |  |
Total purchases | Supplier concentration risk | Major supplier four |  |  |
Major Customers And Suppliers [Line Items] |  |  |
Concentration risk, percentage | 16.00% |  |

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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. + Details
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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 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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