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Franchise Rights Acquired, Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)			3 Months Ended	12 Months Ended
	May 06, 2018	May 07, 2017	Dec. 30, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure
Goodwill impairment				$ 0	$ 13,323,000	$ 0
Finite-lived intangible assets, aggregate amortization expense				$ 28,995,000	36,040,000	$ 35,752,000
Franchise Rights | VPM
Goodwill and Intangible Assets Disclosure
Amortization period				2 years
Franchise Rights | Weight Watchers of Greater Miami, Inc.
Goodwill and Intangible Assets Disclosure
Amortization period				3 months
Franchise Rights | South Carolina Acquisition
Goodwill and Intangible Assets Disclosure
Amortization period				18 years
Franchise Rights
Goodwill and Intangible Assets Disclosure
Indefinite-lived intangible assets, impairment charges	$ 0	$ 0
BRAZIL
Goodwill and Intangible Assets Disclosure
Goodwill impairment			$ 13,323,000		$ 13,323,000

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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