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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
Dec. 31, 2022
Jan. 01, 2022
Jan. 02, 2021
Segment Reporting Information [Line Items]        
Revenues, net   $ 1,040,856 $ 1,212,463 $ 1,378,124
Operating (loss) income   (282,950) 196,284 216,162
Interest expense   81,141 87,909 123,310
Other expense, net   1,691 1,358 349
Early extinguishment of debt $ 29,169   30,352  
(Benefit from) provision for income taxes   (114,379) 9,773 17,462
Net (loss) income   (251,403) 66,892 75,041
Net loss attributable to the noncontrolling interest       38
Net (loss) income attributable to WW International, Inc.   (251,403) 66,892 75,079
Depreciation and amortization   48,819 54,686 59,522
Operating Segments        
Segment Reporting Information [Line Items]        
Operating (loss) income   (135,667) 348,879 407,460
Depreciation and amortization   34,181 41,941 42,742
General Corporate        
Segment Reporting Information [Line Items]        
General corporate expenses   147,283 152,595 191,298
Depreciation and amortization   14,638 12,745 16,780
North America        
Segment Reporting Information [Line Items]        
Revenues, net   728,379 816,418 946,307
North America | Operating Segments        
Segment Reporting Information [Line Items]        
Revenues, net   728,379 816,418 946,307
Operating (loss) income   (218,997) 218,257 271,123
Depreciation and amortization   32,521 39,270 39,740
International        
Segment Reporting Information [Line Items]        
Revenues, net   312,477 396,045 431,817
International | Operating Segments        
Segment Reporting Information [Line Items]        
Revenues, net   312,477 396,045 431,817
Operating (loss) income   83,330 130,622 136,337
Depreciation and amortization   $ 1,660 $ 2,671 $ 3,002