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Computation of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Numerator:
Net income attributable to Weight Watchers International, Inc.	$ 34,658	$ 21,790	$ 54,400	$ 44,234
Denominator:
Weighted average shares of common stock outstanding	63,782	57,107	63,690	57,000
Effect of dilutive common stock equivalents	2,059	159	2,182	167
Weighted average diluted common shares outstanding	65,841	57,266	65,872	57,167
Earnings Per Share attributable to Weight Watchers International, Inc.
Basic	$ 0.54	$ 0.38	$ 0.85	$ 0.78
Diluted	$ 0.53	$ 0.38	$ 0.83	$ 0.77

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