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Computation of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 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	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Numerator:
Net income attributable to Weight Watchers International, Inc.									$ 67,699	$ 32,945	$ 117,787
Denominator:
Weighted average shares of common stock outstanding									63,742	58,369	56,607
Effect of dilutive common stock equivalents									2,155	597	98
Weighted average diluted common shares outstanding									65,897	58,966	56,705
Earnings Per Share attributable to Weight Watchers International, Inc.
Basic	$ 0.21	$ 0.54	$ 0.48	$ (0.17)	$ (0.18)	$ 0.38	$ 0.49	$ (0.10)	$ 1.06	$ 0.56	$ 2.08
Diluted	$ 0.20	$ 0.53	$ 0.46	$ (0.17)	$ (0.18)	$ 0.38	$ 0.49	$ (0.10)	$ 1.03	$ 0.56	$ 2.08

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