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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		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Numerator:
Net income attributable to WW International, Inc.	$ 14,006	$ 53,834	$ 7,943	$ 43,148
Denominator:
Weighted average shares of common stock outstanding	67,641	67,124	67,538	67,044
Effect of dilutive common stock equivalents	2,158	2,017	2,360	2,224
Weighted average diluted common shares outstanding	69,799	69,141	69,898	69,268
Earnings per share attributable to WW International, Inc.
Basic	$ 0.21	$ 0.80	$ 0.12	$ 0.64
Diluted	$ 0.20	$ 0.78	$ 0.11	$ 0.62

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