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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		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Numerator:
Net income attributable to Weight Watchers International, Inc.	$ 44,719	$ 34,658	$ 100,544	$ 54,400
Denominator:
Weighted average shares of common stock outstanding	64,463	63,782	64,237	63,690
Effect of dilutive common stock equivalents	4,223	2,059	3,702	2,182
Weighted average diluted common shares outstanding	68,686	65,841	67,939	65,872
Earnings Per Share attributable to Weight Watchers International, Inc.
Basic	$ 0.69	$ 0.54	$ 1.57	$ 0.85
Diluted	$ 0.65	$ 0.53	$ 1.48	$ 0.83

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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 amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units 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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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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