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Per Share Data - Computation of Basic and Diluted Loss Per Share Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Numerator:
Net loss attributable to WW International, Inc.	$ (6,063)	$ (10,687)
Denominator:
Weighted average shares of common stock outstanding	67,436	66,964
Effect of dilutive common stock equivalents	0	0
Weighted average diluted common shares outstanding	67,436	66,964
Net loss per share attributable to WW International, Inc.
Basic	$ (0.09)	$ (0.16)
Diluted	$ (0.09)	$ (0.16)

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