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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands	Aug. 16, 2021	Jul. 30, 2021	Mar. 22, 2021	Oct. 02, 2021	Jan. 02, 2021
Business Acquisition [Line Items]
Goodwill				$ 157,529	$ 155,617
Weight Watchers of Maine, Inc.
Business Acquisition [Line Items]
Business acquisition, aggregate purchase price	$ 2,250
Business acquisition, cash payment	1,999
Business acquisition, assumed net liabilities	26
Business acquisition, cash in reserves	225
Goodwill	2,153
Weight Watchers of Maine, Inc. | Franchise Rights
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, indefinite lived intangible assets	41
Weight Watchers of Maine, Inc. | Customer Relationship
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, finite lived intangible assets	$ 56
The WW Group, Inc.
Business Acquisition [Line Items]
Business acquisition, aggregate purchase price			$ 17,500
Business acquisition, cash payment		$ 6,450	8,255
Business acquisition, assumed net liabilities			495
Business acquisition, cash in reserves			2,300
Business acquisition, purchase price allocation, inventories			162
Business acquisition, purchase price allocation, property and equipment			41
Business acquisition, purchase price allocation, other assets			4
The WW Group, Inc. | Franchise Rights
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, indefinite lived intangible assets			16,885
The WW Group, Inc. | Customer Relationship
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, finite lived intangible assets			408
The WW Group Co.
Business Acquisition [Line Items]
Business acquisition, aggregate purchase price			3,114
Business acquisition, cash payment			2,605
Business acquisition, cash in reserves			599
Business acquisition, purchase price allocation, inventories			6
Business acquisition, purchase price allocation, property and equipment			25
Business acquisition, purchase price allocation, other assets			1
Business acquisition, assumed net assets			90
The WW Group Co. | Franchise Rights
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, indefinite lived intangible assets			3,040
The WW Group Co. | Customer Relationship
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, finite lived intangible assets			$ 42

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