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Basis of Presentation - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2023
Income Taxes [Line Items]
Percentage of equity interest of physician-owners	100.00%

X

- Definition

Income taxes.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of equity interest of physician-owners

+ References

No definition available.

+ Details

Name:	ww_PercentageOfEquityInterestOfPhysicianOwners
Namespace Prefix:	ww_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration