ACCOUNTS RECEIVABLE - Changes of allowance for doubtful accounts (Details) - USD ($)	12 Months Ended
Sep. 30, 2023	Sep. 30, 2022
ACCOUNTS RECEIVABLE
Beginning balance	$ 255,322	$ 2,221,870
Additional reserve through bad debt expense	6,366,356	192,298
Reduction due to accounts receivable factoring	0	(2,104,366)
Exchange difference	(4,193)	(54,480)
Ending balance	$ 6,617,485	$ 255,322

No definition available.

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Balance Type:	na
Period Type:	duration

- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-4

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of increase in allowance for credit loss on accounts receivable, from recovery.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of recoveries of receivables doubtful of collection that were previously charged on exchange difference.

+ References

No definition available.

+ Details

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Namespace Prefix:	zkin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of allowance for doubtful accounts, reduction due to accounts receivable factoring.

+ References

No definition available.

+ Details

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Namespace Prefix:	zkin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration