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Accounts receivable, net (Details 1) - USD ($)	6 Months Ended	12 Months Ended
	Mar. 31, 2025	Sep. 30, 2024
Credit Loss [Abstract]
Beginning balance	$ 75,931	$ 302,084
Addition (reversal)	79,724	(231,966)
Exchange rate effect	(2,787)	5,813
Ending balance	$ 152,868	$ 75,931

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- References

No definition available.

+ Details

Name:	CIK0001979610_AdditionReversal
Namespace Prefix:	CIK0001979610_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	CIK0001979610_AllowanceForDoubtfulAccountsPremiumAndOtherReceivables
Namespace Prefix:	CIK0001979610_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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No definition available.

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Name:	CIK0001979610_ExchangeRateDifference
Namespace Prefix:	CIK0001979610_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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