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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

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