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Leases - Schedule of Lease Assets and Lease Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 24, 2025	Dec. 28, 2024
Assets:
Operating leases	$ 3,229	$ 3,491	$ 42,047
Total lease assets	3,229		42,047
Current
Operating leases	1,256	9,094	8,168
Noncurrent
Operating leases	2,198	$ 2,588	44,322
Total lease liabilities	$ 3,454		$ 52,490

X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Finance lease and operating lease assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	ww_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Lease assets lessee.

+ References

No definition available.

+ Details

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

X

- Definition

Lease liabilities current.

+ References

No definition available.

+ Details

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

X

- Definition

Lease liabilities noncurrent.

+ References

No definition available.

+ Details

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

X

- Definition

Operating and finance lease liabilities.

+ References

No definition available.

+ Details

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