Quantifying misstatement prior period financial statements amount.

No definition available.

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

Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022
Income Taxes [Line Items]
Percentage of equity interest of physician-owners		100.00%
Income Tax Expense (Benefit)
Income Taxes [Line Items]
Amount of error being corrected	$ (2,150)		$ (2,150)