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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands | Oct. 21, 2019 | Dec. 10, 2018 | Aug. 10, 2018 | Dec. 28, 2019 | Dec. 29, 2018
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Business Acquisition [Line Items] |  |  |  |  |
Business acquisition, purchase price allocation, goodwill |  |  |  | $ 157,916 | $ 152,519
Kurbo Health, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition, purchase price allocation, net purchase price |  |  | $ 3,063 |  |
Business acquisition, purchase price allocation, goodwill |  |  | 1,101 |  |
Business acquisition, purchase price allocation, prepaid expenses |  |  | 78 |  |
Business acquisition, purchase price allocation, other assets |  |  | 32 |  |
Business acquisition, purchase price allocation, deferred revenue |  |  | 57 |  |
Business acquisition, purchase price allocation, other liabilities |  |  | 7 |  |
Weight Watchers of Las Vegas, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition, purchase price allocation, net purchase price | $ 4,500 |  |  |  |
Business acquisition, purchase price allocation, goodwill | 4,111 |  |  |  |
Business acquisition, net purchase price | 4,060 |  |  |  |
Business acquisition, cash acquired | 385 |  |  |  |
Business acquisition, assumed net liabilities | 55 |  |  |  |
South Carolina Acquisition |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition, net purchase price |  | $ 4,000 |  |  |
Business acquisition, assumed net liabilities |  | 37 |  |  |
Website Development | Kurbo Health, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition, purchase price allocation, finite lived intangible assets |  |  | $ 1,916 |  |
Customer Relationships | Weight Watchers of Las Vegas, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition, purchase price allocation, finite lived intangible assets | 271 |  |  |  |
Customer Relationships | South Carolina Acquisition |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition, purchase price allocation, finite lived intangible assets |  | 209 |  |  |
Franchise Rights | Weight Watchers of Las Vegas, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition, purchase price allocation, indefinite lived intangible assets | $ 118 |  |  |  |
Franchise Rights | South Carolina Acquisition |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition, purchase price allocation, net purchase price |  | 4,000 |  |  |
Business acquisition, purchase price allocation, indefinite lived intangible assets |  | $ 3,791 |  |  |

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