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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 02, 2022	Jul. 02, 2022
Income Tax Expense (Benefit)
Income Taxes [Line Items]
Amount of error being corrected	$ (2,150)	$ (2,150)

X

- Definition

Income taxes.

+ References

No definition available.

+ Details

Name:	ww_IncomeTaxesLineItems
Namespace Prefix:	ww_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Quantifying misstatement prior period financial statements amount.

+ References

No definition available.

+ Details

Name:	ww_QuantifyingMisstatementPriorPeriodFinancialStatementsAmount
Namespace Prefix:	ww_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis=ww_IncomeTaxExpenseBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: