CONSOLIDATED STATEMENTS OF NET INCOME - USD ($) shares in Thousands	12 Months Ended
	Jan. 01, 2022	Jan. 02, 2021	Dec. 28, 2019
Revenues, net	$ 1,212,463,000	$ 1,378,124,000	$ 1,413,337,000
Cost of revenues	486,108,000	600,283,000	626,655,000
Gross profit	726,355,000	777,841,000	786,682,000
Marketing expenses	261,457,000	260,727,000	243,998,000
Selling, general and administrative expenses	268,614,000	297,287,000	254,699,000
Goodwill impairment		3,665,000
Operating income	196,284,000	216,162,000	287,985,000
Interest expense	87,909,000	123,310,000	135,267,000
Other expense, net	1,358,000	349,000	1,758,000
Early extinguishment of debt	30,352,000
Income before income taxes	76,665,000	92,503,000	150,960,000
Provision for income taxes	9,773,000	17,462,000	31,513,000
Net income	66,892,000	75,041,000	119,447,000
Net loss attributable to the noncontrolling interest		38,000	169,000
Net income attributable to WW International, Inc.	$ 66,892,000	$ 75,079,000	$ 119,616,000
Earnings per share attributable to WW International, Inc.
Basic	$ 0.96	$ 1.11	$ 1.78
Diluted	$ 0.95	$ 1.07	$ 1.72
Weighted average common shares outstanding
Basic	69,640	67,849	67,188
Diluted	70,744	70,020	69,550
Subscription
Revenues, net	$ 1,063,039,000	$ 1,186,489,000	$ 1,207,266,000
Cost of revenues	370,064,000	452,882,000	502,907,000
Product and Other
Revenues, net	149,424,000	191,635,000	206,071,000
Cost of revenues	$ 116,044,000	$ 147,401,000	$ 123,748,000