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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
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Numerator:
Net income attributable to WW International, Inc.	$ 46,330	$ 54,525	$ 36,963	$ 62,468
Denominator:
Weighted average shares of common stock outstanding	69,875	68,013	69,516	67,697
Effect of dilutive common stock equivalents	985	1,989	1,350	2,239
Weighted average diluted common shares outstanding	70,860	70,002	70,866	69,936
Earnings per share attributable to WW International, Inc.
Basic	$ 0.66	$ 0.80	$ 0.53	$ 0.92
Diluted	$ 0.65	$ 0.78	$ 0.52	$ 0.89

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