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Quarterly Financial Information - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 02, 2016
Oct. 03, 2015
Jul. 04, 2015
Apr. 04, 2015
Jan. 03, 2015
Sep. 27, 2014
Jul. 28, 2014
Jun. 28, 2014
Mar. 29, 2014
Jun. 29, 2013
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Quarterly Financial Information [Line Items]                          
Employee termination benefit costs, pretax $ 1,338 $ 1,081 $ 232 $ 5,761 $ 973 $ 713   $ 6,498 $ 3,656   $ 8,412 $ 11,840  
Employee termination benefit costs, after tax 815 $ 660 142 3,514 $ 593 $ 430   $ 3,964 2,235   5,131 7,222  
Impact of early extinguishment of debt on net income before of tax     6,727 4,749     $ 2,350   10,540 $ 21,685 11,426 0 $ (21,685)
Impact of early extinguishment of debt on net income net of tax     $ 4,103 $ 2,897         $ 6,396        
Impact of early extinguishment of debt per fully diluted share     $ 0.07 $ 0.05     $ 0.04   $ 0.11        
Net income attributable to Weight Watchers International, Inc.                     32,945 $ 117,787 $ 202,742
Ms. Winfrey                          
Quarterly Financial Information [Line Items]                          
Impact of related party transaction expense on net income before of tax                     13,593    
Impact of related party transaction expense on net income net of tax                     $ 8,292    
Impact of related party transaction expense per fully diluted share                     $ 0.13    
Adjustments                          
Quarterly Financial Information [Line Items]                          
Net income attributable to Weight Watchers International, Inc. $ 410   $ 420               $ 320