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Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Numerator:
Net income attributable to Weight Watchers International, Inc.									$ 223,749	$ 163,514	$ 67,699
Denominator:
Weighted average shares of common stock outstanding									66,280	64,329	63,742
Effect of dilutive common stock equivalents									3,835	3,919	2,155
Weighted average diluted common shares outstanding									70,115	68,248	65,897
Earnings Per Share attributable to Weight Watchers International, Inc.
Basic	$ 0.65	$ 1.05	$ 1.07	$ 0.60	$ 0.97	$ 0.69	$ 0.70	$ 0.17	$ 3.38	$ 2.54	$ 1.06
Diluted	$ 0.63	$ 1.00	$ 1.01	$ 0.56	$ 0.91	$ 0.65	$ 0.67	$ 0.16	$ 3.19	$ 2.40	$ 1.03

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