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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. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Numerator:
Net income attributable to WW International, Inc.	$ 47,086	$ 70,132	$ 90,233	$ 179,964
Denominator:
Weighted average shares of common stock outstanding	67,298	66,701	67,129	66,074
Effect of dilutive common stock equivalents	2,319	3,630	2,235	4,043
Weighted average diluted common shares outstanding	69,617	70,331	69,364	70,117
Earnings Per Share attributable to WW International, Inc.
Basic	$ 0.70	$ 1.05	$ 1.34	$ 2.72
Diluted	$ 0.68	$ 1.00	$ 1.30	$ 2.57

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