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Quarterly Financial Information - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									6 Months Ended	12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Jun. 29, 2013	Jul. 02, 2015	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2015	Jan. 03, 2015
Quarterly Financial Information [Line Items]
Net income attributable to Weight Watchers International, Inc.											$ 67,699	$ 32,945		$ 117,787
Provision (benefit) for income taxes											$ 16,634	$ 22,835		$ 65,931
Earning Per share fully diluted	$ 0.20	$ 0.53	$ 0.46	$ (0.17)	$ (0.18)	$ 0.38	$ 0.49	$ (0.10)			$ 1.03	$ 0.56		$ 2.08
Operating income	$ 46,730	$ 66,792	$ 73,731	$ 13,557	$ 16,326	$ 63,108	$ 70,580	$ 18,044			$ 200,811	$ 168,058		$ 299,314
Employee termination benefit costs, pretax					1,338	1,081	232	5,761
Employee termination benefit costs, after tax					815	$ 660	142	3,514				5,131		7,222
Impact of early extinguishment of debt on net income before of tax							6,727	4,749	$ 21,685		0	11,426		$ 0
Impact of early extinguishment of debt on net income net of tax							$ 4,103	$ 2,897
Impact of early extinguishment of debt per fully diluted share							$ 0.07	$ 0.05
Research and development tax credit and Section 199 deduction for the tax years 2012 through 2015
Quarterly Financial Information [Line Items]
Provision (benefit) for income taxes		$ (11,438)
Earning Per share fully diluted		$ 0.17
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.	1,576	$ (2,684)								$ 420	(1,791)	320	$ (740)
Provision (benefit) for income taxes	$ (110)	$ 2,684									$ 2,138	$ 1,970
Earning Per share fully diluted	$ 0.02	$ (0.04)
Operating income	$ 1,466

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