CONSOLIDATED STATEMENTS OF NET INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Revenues, net	$ 1,413,337	$ 1,514,121	$ 1,306,911
Cost of revenues	626,655	647,711	614,262
Gross profit	786,682	866,410	692,649
Marketing expenses	243,998	226,319	200,797
Selling, general and administrative expenses	254,699	251,106	211,224
Goodwill impairment	0	0	13,323
Operating income	287,985	388,985	267,305
Interest expense	135,267	142,346	112,784
Other expense, net	1,758	2,578	472
Early extinguishment of debt, net	0	0	8,969
Income before income taxes	150,960	244,061	145,080
Provision for (benefit from) income taxes	31,513	20,493	(18,237)
Net income	119,447	223,568	163,317
Net loss attributable to the noncontrolling interest	169	181	197
Net income attributable to WW International, Inc.	$ 119,616	$ 223,749	$ 163,514
Earnings Per Share attributable to WW International, Inc.
Basic	$ 1.78	$ 3.38	$ 2.54
Diluted	$ 1.72	$ 3.19	$ 2.40
Weighted average common shares outstanding
Basic	67,188	66,280	64,329
Diluted	69,550	70,115	68,248
Service
Revenues, net	$ 1,207,266	$ 1,273,196	$ 1,081,679
Cost of revenues	502,907	508,477	486,293
Product and Other
Revenues, net	206,071	240,925	225,232
Cost of revenues	$ 123,748	$ 139,234	$ 127,969