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Segment and Geographic Data - Information About Reportable Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jul. 03, 2021
Jan. 01, 2022
Jan. 02, 2021
Dec. 28, 2019
Segment Reporting Information [Line Items]        
Net revenue   $ 1,212,463 $ 1,378,124 $ 1,413,337
Operating income   196,284 216,162 287,985
Interest expense   87,909 123,310 135,267
Other expense, net   1,358 349 1,758
Early extinguishment of debt $ 29,169 30,352    
Provision for income taxes   9,773 17,462 31,513
Net income   66,892 75,041 119,447
Net loss attributable to the noncontrolling interest     38 169
Net income attributable to WW International, Inc.   66,892 75,079 119,616
Depreciation and amortization   54,686 59,522 54,335
Operating Segments        
Segment Reporting Information [Line Items]        
Operating income   348,879 407,460 391,055
Depreciation and amortization   41,941 42,742 39,597
General corporate expenses        
Segment Reporting Information [Line Items]        
General corporate expenses   152,595 191,298 103,070
Depreciation and amortization   12,745 16,780 14,738
North America        
Segment Reporting Information [Line Items]        
Net revenue   814,797 942,100 979,302
North America | Operating Segments        
Segment Reporting Information [Line Items]        
Net revenue   814,797 942,100 979,302
Operating income   217,901 269,580 281,937
Depreciation and amortization   39,270 39,740 36,643
Continental Europe        
Segment Reporting Information [Line Items]        
Net revenue   297,910 313,380 293,233
Continental Europe | Operating Segments        
Segment Reporting Information [Line Items]        
Net revenue   297,910 313,380 293,233
Operating income   117,390 124,891 95,201
Depreciation and amortization   1,468 1,615 1,709
United Kingdom        
Segment Reporting Information [Line Items]        
Net revenue   65,820 84,387 94,557
United Kingdom | Operating Segments        
Segment Reporting Information [Line Items]        
Net revenue   65,820 84,387 94,557
Operating income   8,134 10,648 9,543
Depreciation and amortization   799 1,017 802
Other        
Segment Reporting Information [Line Items]        
Net revenue   33,936 38,257 46,245
Other | Operating Segments        
Segment Reporting Information [Line Items]        
Net revenue   33,936 38,257 46,245
Operating income   5,454 2,341 4,374
Depreciation and amortization   $ 404 $ 370 $ 443