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Significant Accounting Policies - Schedule of Movements in the Allowance for Credit Losses (Details) ¥ in Thousands	12 Months Ended
	Dec. 31, 2023 CNY (¥)
Accounting Policies [Abstract]
Balance as of January 1
Amounts charged to expenses	19,887
Balance as of December 31	¥ 19,887

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- References

No definition available.

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

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- Definition

Allowance for credit loss, charged to expenses.

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No definition available.

+ Details

Name:	ysg_AllowanceForCreditLossChargedToExpenses
Namespace Prefix:	ysg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

Allowance for doubtful accounts receivable including related party, current.

+ References

No definition available.

+ Details

Name:	ysg_AllowanceForDoubtfulAccountsReceivableIncludingRelatedPartyCurrent
Namespace Prefix:	ysg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant