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Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Numerator:
Net income attributable to Weight Watchers International, Inc.	$ 45,173	$ 30,494	$ 55,825	$ 19,741
Denominator:
Weighted average shares of common stock outstanding	64,269	63,740	64,124	63,644
Effect of dilutive common stock equivalents	3,468	2,194	3,180	2,246
Weighted average diluted common shares outstanding	67,737	65,934	67,304	65,890
Earnings Per Share attributable to Weight Watchers International, Inc.
Basic	$ 0.70	$ 0.48	$ 0.87	$ 0.31
Diluted	$ 0.67	$ 0.46	$ 0.83	$ 0.30

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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