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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
	Jan. 02, 2016	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Numerator:
Net income attributable to Weight Watchers International, Inc.									$ 32,945	$ 117,787	$ 202,742
Denominator:
Weighted average shares of common stock outstanding									58,369	56,607	56,144
Effect of dilutive common stock equivalents									597	98	250
Weighted average diluted common shares outstanding									58,966	56,705	56,394
Earnings Per Share attributable to Weight Watchers International, Inc.
Basic	$ (0.18)	$ 0.38	$ 0.49	$ (0.10)	$ 0.08	$ 0.67	$ 0.95	$ 0.38	$ 0.56	$ 2.08	$ 3.61
Diluted	$ (0.18)	$ 0.38	$ 0.49	$ (0.10)	$ 0.08	$ 0.67	$ 0.95	$ 0.38	$ 0.56	$ 2.08	$ 3.60

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