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Per Share Data - Computation of Basic and Diluted Loss Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Apr. 03, 2021
Mar. 28, 2020
Numerator:    
Net loss attributable to WW International, Inc. $ (18,227) $ (6,063)
Denominator:    
Weighted average shares of common stock outstanding 69,084 67,436
Weighted average diluted common shares outstanding 69,084 67,436
Net loss per share attributable to WW International, Inc.    
Basic $ (0.26) $ (0.09)
Diluted $ (0.26) $ (0.09)