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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2015	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2015	Jan. 03, 2015
Disclosure Basis Of Presentation Details [Line Items]
Income before income taxes				$ 84,127	$ 55,614		$ 183,664
Net income attributable to Weight Watchers International, Inc.				67,699	32,945		117,787
Provision for income taxes				16,634	22,835		$ 65,931
Adjustments
Disclosure Basis Of Presentation Details [Line Items]
Income before income taxes				347	1,650
Net income attributable to Weight Watchers International, Inc.	$ 1,576	$ (2,684)	$ 420	(1,791)	320	$ (740)
Provision for income taxes	$ (110)	$ 2,684		$ 2,138	$ 1,970

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