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Franchise Rights Acquired, Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 06, 2018 | May 07, 2017 | Dec. 30, 2017 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Goodwill and Intangible Assets Disclosure |  |  |  |  |  |
Goodwill impairment |  |  |  | $ 0 | $ 13,323,000 | $ 0
Finite-lived intangible assets, aggregate amortization expense |  |  |  | $ 28,995,000 | 36,040,000 | $ 35,752,000
Franchise Rights | VPM |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure |  |  |  |  |  |
Amortization period |  |  |  | 2 years |  |
Franchise Rights | Weight Watchers of Greater Miami, Inc. |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure |  |  |  |  |  |
Amortization period |  |  |  | 3 months |  |
Franchise Rights | South Carolina Acquisition |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure |  |  |  |  |  |
Amortization period |  |  |  | 18 years |  |
Franchise Rights |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure |  |  |  |  |  |
Indefinite-lived intangible assets, impairment charges | $ 0 | $ 0 |  |  |  |
BRAZIL |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure |  |  |  |  |  |
Goodwill impairment |  |  | $ 13,323,000 |  | $ 13,323,000 |

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