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ACCOUNTS RECEIVABLE, NET - Allowance for credit losses movement (Details) - USD ($)	6 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Allowance for doubtful accounts movement
Beginning balance	$ 780,109	$ 634,166	$ 634,166	$ 694,257	$ 736,725
Reversal		(16,087)		(96,408)
Additions	273,849		52,645	52,323	29,128
Foreign currency translation adjustments	(22,183)	7,362	28,368	(16,006)	(71,596)
Ending balance	$ 1,031,775	690,371	780,109	634,166	$ 694,257
Adoption ASU 2016-13
Allowance for doubtful accounts movement
Beginning balance		$ 64,930	$ 64,930
Ending balance				$ 64,930

X

- Definition

Amount of foreign currency translation adjustments to allowance for credit loss on accounts receivable.

+ References

No definition available.

+ Details

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X

- Definition

Amount of expense for expected credit loss on accounts receivable.

+ References

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+ Details

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X

- Definition

Amount of reversal of expense for expected credit loss on accounts receivable.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- 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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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