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Earnings Per Share - 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. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Numerator:
Net income attributable to WW International, Inc.	$ 54,525	$ 47,086	$ 62,468	$ 90,233
Denominator:
Weighted average shares of common stock outstanding	68,013	67,298	67,697	67,129
Effect of dilutive common stock equivalents	1,989	2,319	2,239	2,235
Weighted average diluted common shares outstanding	70,002	69,617	69,936	69,364
Earnings per share attributable to WW International, Inc.
Basic	$ 0.80	$ 0.70	$ 0.92	$ 1.34
Diluted	$ 0.78	$ 0.68	$ 0.89	$ 1.30

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