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Franchise Rights Acquired, Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Oct. 01, 2016	Jul. 02, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015	Jun. 27, 2016	Jan. 02, 2016
Goodwill and Intangible Assets Disclosure
Recruitment percentage for change in impairment review		40.00%
Franchise right maturity period				7 years
Goodwill	$ 167,638			$ 167,638			$ 159,331
Finite-lived intangible assets, aggregate amortization expense	$ 9,137		$ 7,743	$ 26,161	$ 26,771
Weight Watchers of Greater Miami, Inc.
Goodwill and Intangible Assets Disclosure
Goodwill						$ 2,945
BRAZIL
Goodwill and Intangible Assets Disclosure
Reporting unit, percentage of fair value in excess of carrying amount	10.00%			10.00%
Goodwill	$ 19,409			$ 19,409
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

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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.

+ References

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-Publisher FASB
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-Section 50
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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Percentage of fair value of reporting unit in excess of carrying amount.

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