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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
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Numerator:
Net income attributable to Weight Watchers International, Inc.	$ 21,790	$ 37,892	$ 44,234	$ 113,425
Denominator:
Weighted average shares of common stock outstanding	57,107	56,675	57,000	56,575
Effect of dilutive common stock equivalents	159	94	167	71
Weighted average diluted common shares outstanding	57,266	56,769	57,167	56,646
Earnings Per Share attributable to Weight Watchers International, Inc.
Basic	$ 0.38	$ 0.67	$ 0.78	$ 2.00
Diluted	$ 0.38	$ 0.67	$ 0.77	$ 2.00

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