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Summary of significant accounting policies (Details 1)	12 Months Ended
	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

X

- 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

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

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- Details

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- Details

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- Details

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- Details

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