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Network
174 - Disclosure - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail)
(http://www.weightwatchersinternational.com/taxonomy/role/DisclosureReconciliationOfBeginningAndEndingAmountOfUnrecognizedTaxBenefits)
TableIncome Tax Contingency [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000105319 (http://www.sec.gov/CIK)
Legal EntityEntity [Domain]
Income Tax Contingency [Line Items]Period [Axis]
2016-01-03 - 2016-12-31
2015-01-04 - 2016-01-02
2013-12-29 - 2015-01-03
Balance at beginning of year
7,698,000  
6,268,000  
5,784,000  
Additions based on tax positions related to the current year
4,580,000  
2,106,000  
1,304,000  
Reductions for tax positions of prior years
(3,299,000) 
(676,000) 
(820,000) 
Balance at end of year
8,979,000  
 
7,698,000  
 
6,268,000