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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands | Aug. 16, 2021 | Jul. 30, 2021 | Mar. 22, 2021 | Oct. 26, 2020 | Oct. 21, 2019 | Jan. 01, 2022 | Jan. 02, 2021 | Dec. 28, 2019
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Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 157,374 | $ 155,617 | $ 157,916
Weight Watchers of Maine, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, aggregate purchase price | $ 2,250 |  |  |  |  |  |  |
Business acquisition, cash payment | 1,999 |  |  |  |  |  |  |
Business acquisition, assumed net liabilities | 26 |  |  |  |  |  |  |
Business acquisition, cash in reserves | 225 |  |  |  |  |  |  |
Goodwill | 2,153 |  |  |  |  |  |  |
The WW Group, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, aggregate purchase price |  |  | $ 17,500 |  |  |  |  |
Business acquisition, cash payment |  | $ 6,450 | 8,255 |  |  |  |  |
Business acquisition, assumed net liabilities |  |  | 495 |  |  |  |  |
Business acquisition, cash in reserves |  |  | 2,300 |  |  |  |  |
Business acquisition, purchase price allocation, inventories |  |  | 162 |  |  |  |  |
Business acquisition, purchase price allocation, property and equipment |  |  | 41 |  |  |  |  |
Business acquisition, purchase price allocation, other assets |  |  | 4 |  |  |  |  |
The WW Group Co. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, aggregate purchase price |  |  | 3,114 |  |  |  |  |
Business acquisition, cash payment |  |  | 2,605 |  |  |  |  |
Business acquisition, cash in reserves |  |  | 599 |  |  |  |  |
Business acquisition, purchase price allocation, inventories |  |  | 6 |  |  |  |  |
Business acquisition, purchase price allocation, property and equipment |  |  | 25 |  |  |  |  |
Business acquisition, purchase price allocation, other assets |  |  | 1 |  |  |  |  |
Business acquisition, assumed net assets |  |  | 90 |  |  |  |  |
Weight Watchers of Arizona, Inc. and Weight Watchers Imperial County, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, aggregate purchase price |  |  |  | $ 10,000 |  |  |  |
Business acquisition, cash payment |  |  |  | 10,037 |  |  |  |
Business acquisition, purchase price allocation, inventories |  |  |  | 84 |  |  |  |
Business acquisition, purchase price allocation, property and equipment |  |  |  | 131 |  |  |  |
Business acquisition, assumed net assets |  |  |  | 37 |  |  |  |
Business acquisition, purchase price allocation, current assets, other |  |  |  | 12 |  |  |  |
Weight Watchers of Las Vegas, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, aggregate purchase price |  |  |  |  | $ 4,500 |  |  |
Business acquisition, cash payment |  |  |  |  | 4,060 |  |  |
Business acquisition, assumed net liabilities |  |  |  |  | 55 |  |  |
Goodwill |  |  |  |  | 4,111 |  |  |
Business acquisition, cash in reserves |  |  |  |  | 385 |  |  |
Franchise Rights | Weight Watchers of Maine, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, indefinite lived intangible assets | 41 |  |  |  |  |  |  |
Franchise Rights | The WW Group, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, indefinite lived intangible assets |  |  | 16,885 |  |  |  |  |
Franchise Rights | The WW Group Co. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, indefinite lived intangible assets |  |  | 3,040 |  |  |  |  |
Franchise Rights | Weight Watchers of Arizona, Inc. and Weight Watchers Imperial County, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, indefinite lived intangible assets |  |  |  | 9,546 |  |  |  |
Franchise Rights | Weight Watchers of Las Vegas, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, indefinite lived intangible assets |  |  |  |  | 118 |  |  |
Customer Relationship | Weight Watchers of Maine, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, finite lived intangible assets | $ 56 |  |  |  |  |  |  |
Customer Relationship | The WW Group, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, finite lived intangible assets |  |  | 408 |  |  |  |  |
Customer Relationship | The WW Group Co. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, finite lived intangible assets |  |  | $ 42 |  |  |  |  |
Customer Relationship | Weight Watchers of Arizona, Inc. and Weight Watchers Imperial County, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, finite lived intangible assets |  |  |  | $ 227 |  |  |  |
Customer Relationship | Weight Watchers of Las Vegas, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, finite lived intangible assets |  |  |  |  | $ 271 |  |  |

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