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Franchise Rights Acquired, Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 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	$ 168,482		$ 168,482			$ 159,331
Finite-lived intangible assets, aggregate amortization expense	$ 8,603	$ 9,810	$ 17,023	$ 19,028
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	$ 18,045		$ 18,045
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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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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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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