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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Sep. 28, 2024	Jun. 24, 2025	Sep. 30, 2025	Sep. 28, 2024
Income Taxes [Line Items]
Effective tax rate	(1450.80%)	(1219.50%)	37.20%	0.10%		(3.40%)
Cancellation of debt income					$ 951,515

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 231
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482663/740-10-55-231

+ Details

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X

- Definition

Cancellation of debt income.

+ References

No definition available.

+ Details

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Namespace Prefix:	ww_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Income taxes.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration