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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 10, 2018	Aug. 10, 2018	Jun. 27, 2016	Dec. 29, 2018	Dec. 30, 2017
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, goodwill				$ 152,519	$ 156,281
Kurbo Health, Inc.
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, net purchase price		$ 3,063
Business acquisition, purchase price allocation, goodwill		1,101
Business acquisition, purchase price allocation, prepaid expenses		78
Business acquisition, purchase price allocation, other assets		32
Business acquisition, purchase price allocation, deferred revenue		57
Business acquisition, purchase price allocation, other liabilities		7
South Carolina Acquisition
Business Acquisition [Line Items]
Business acquisition, net purchase price	$ 4,000
Business acquisition, assumed net liabilities	37
Weight Watchers of Greater Miami, Inc.
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, net purchase price			$ 3,250
Business acquisition, purchase price allocation, goodwill			2,945
Business acquisition, net purchase price			2,898
Business acquisition, assumed net liabilities			52
Business acquisition, cash acquired			300
Website Development | Kurbo Health, Inc.
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, finite lived intangible assets		$ 1,916
Franchise Rights | South Carolina Acquisition
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, net purchase price	4,000
Business acquisition, purchase price allocation, indefinite lived intangible assets	3,791
Franchise Rights | Weight Watchers of Greater Miami, Inc.
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, indefinite lived intangible assets			114
Customer Relationships | South Carolina Acquisition
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, finite lived intangible assets	$ 209
Customer Relationships | Weight Watchers of Greater Miami, Inc.
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, finite lived intangible assets			$ 191

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