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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands | Feb. 18, 2022 | Dec. 21, 2021 | Aug. 16, 2021 | Jul. 30, 2021 | Mar. 22, 2021 | Oct. 01, 2022 | Jan. 01, 2022 | Jan. 02, 2021
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Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 156,155 | $ 157,374 | $ 155,617
Denross Limited |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, aggregate purchase price | $ 4,500 |  |  |  |  |  |  |
Business acquisition, cash payment | 3,100 | $ 650 |  |  |  |  |  |
Business acquisition, purchase price allocation, assumed liabilities | 166 |  |  |  |  |  |  |
Business acquisition, cash in reserves | 750 |  |  |  |  |  |  |
Goodwill | 4,645 |  |  |  |  |  |  |
Business acquisition, purchase price allocation, deferred tax asset | 496 |  |  |  |  |  |  |
Business acquisition, purchase price allocation, tax asset valuation allowance | 496 |  |  |  |  |  |  |
Business acquisition, purchase price allocation, cash | 4 |  |  |  |  |  |  |
Business acquisition, purchase price allocation, other receivables | 3 |  |  |  |  |  |  |
Denross Limited | Customer Relationship |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, finite lived intangible assets | 14 |  |  |  |  |  |  |
Checkweight Limited |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, aggregate purchase price | 1,500 |  |  |  |  |  |  |
Business acquisition, cash payment | 1,250 |  |  |  |  |  |  |
Business acquisition, purchase price allocation, assumed liabilities | 56 |  |  |  |  |  |  |
Business acquisition, cash in reserves | 250 |  |  |  |  |  |  |
Goodwill | 1,291 |  |  |  |  |  |  |
Business acquisition, purchase price allocation, deferred tax asset | 5 |  |  |  |  |  |  |
Business acquisition, purchase price allocation, tax asset valuation allowance | 5 |  |  |  |  |  |  |
Business acquisition, purchase price allocation, cash | 4 |  |  |  |  |  |  |
Business acquisition, purchase price allocation, other receivables | 4 |  |  |  |  |  |  |
Checkweight Limited | Customer Relationship |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, finite lived intangible assets | 17 |  |  |  |  |  |  |
Checkweight Limited | Franchise Rights |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, finite lived intangible assets | $ 240 |  |  |  |  |  |  |
Weight Watchers of Maine, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, aggregate purchase price |  |  | $ 2,250 |  |  |  |  |
Business acquisition, cash payment |  |  | 1,999 |  |  |  |  |
Business acquisition, cash in reserves |  |  | 225 |  |  |  |  |
Goodwill |  |  | 2,153 |  |  |  |  |
Business acquisition, assumed net liabilities |  |  | 26 |  |  |  |  |
Weight Watchers of Maine, Inc. | Customer Relationship |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, finite lived intangible assets |  |  | 56 |  |  |  |  |
Weight Watchers of Maine, Inc. | Franchise Rights |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, finite lived intangible assets |  |  | $ 41 |  |  |  |  |
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, cash in reserves |  |  |  |  | 2,300 |  |  |
Business acquisition, assumed net liabilities |  |  |  |  | 495 |  |  |
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, Inc. | Customer Relationship |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, finite lived intangible assets |  |  |  |  | 408 |  |  |
The WW Group, Inc. | Franchise Rights |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, indefinite lived intangible assets |  |  |  |  | 16,885 |  |  |
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 |  |  |
The WW Group Co. | Customer Relationship |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, finite lived intangible assets |  |  |  |  | 42 |  |  |
The WW Group Co. | Franchise Rights |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, purchase price allocation, indefinite lived intangible assets |  |  |  |  | $ 3,040 |  |  |

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