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Leases - Additional Information (Detail)	6 Months Ended
	Jun. 27, 2020
Lessee Lease Description [Line Items]
Lease weighted average remaining lease term	6 years 10 months 28 days
Minimum
Lessee Lease Description [Line Items]
Leases, remaining lease term	0 years
Maximum
Lessee Lease Description [Line Items]
Leases, remaining lease term	12 years

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Lease weighted average remaining lease term.

+ References

No definition available.

+ Details

Name:	ww_LeaseWeightedAverageRemainingLeaseTerm
Namespace Prefix:	ww_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Lessee remaining lease term.

+ References

No definition available.

+ Details

Name:	ww_LesseeRemainingLeaseTerm
Namespace Prefix:	ww_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: