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v3.20.2

Leases - Additional Information (Detail) | 9 Months Ended
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Sep. 26, 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: |