TAXES - Valuation Allowance (Details) - USD ($)	6 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Valuation allowance roll forward
Beginning balance	$ 215,526	$ 21,910
Additions	56,808	196
Reversals	(6,379)
Foreign currency translation adjustments	(7,282)	229
Ending balance	$ 258,673	$ 22,336

Amount of decrease in the valuation allowance for a specified deferred tax asset due to reversals in the period.

No definition available.

Name:	ntcl_ValuationAllowanceDeferredTaxAssetDecreaseDueToReversalsAmount
Namespace Prefix:	ntcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset due to foreign currency translation adjustments.

+ References

No definition available.

+ Details

Name:	ntcl_ValuationAllowanceDeferredTaxAssetIncreaseDecreaseDueToForeignCurrencyTranslationsAmount
Namespace Prefix:	ntcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of increase in the valuation allowance for a specified deferred tax asset due to additions in the period.

+ References

No definition available.

+ Details

Name:	ntcl_ValuationAllowanceDeferredTaxAssetIncreaseDueToAdditionsAmount
Namespace Prefix:	ntcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_ValuationAllowanceAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration