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Summary of significant accounting policies (Details 1) | 12 Months Ended
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Sep. 30, 2018
Machinery and equipment |
Accounting Policies [Line Items] |
Estimated useful lives | 5 - 10 years
Transportation equipment |
Accounting Policies [Line Items] |
Estimated useful lives | 4 years
Office equipment |
Accounting Policies [Line Items] |
Estimated useful lives | 3 - 5 years
Leasehold improvement |
Accounting Policies [Line Items] |
Estimated useful lives | Shorter of lease term or useful life

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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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Balance Type: | na
Period Type: | duration

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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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