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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 19, 2015 | Jul. 14, 2015 | Oct. 03, 2015 | Jul. 04, 2015 | Sep. 27, 2014 | Oct. 03, 2015 | Sep. 27, 2014 | Dec. 31, 2015 | Jan. 03, 2015 | Dec. 28, 2013
Disclosure Basis Of Presentation Details [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 2,239,823 |  |  | $ 2,239,823 |  |  | $ 2,358,000 |
Cash and cash equivalents |  |  | 212,260 |  | $ 327,381 | 212,260 | $ 327,381 |  | 301,212 | $ 174,557
Credit facility drew down amount |  | $ 48,000 |  |  |  |  |  |  |  |
Revenue |  |  | 273,324 |  | 345,184 | 905,181 | 1,152,089 |  |  |
Income before income taxes |  |  | 32,553 |  | 56,916 | 70,170 | 175,461 |  |  |
Net income attributable to Weight Watchers International, Inc. |  |  | 21,790 |  | $ 37,892 | 44,234 | $ 113,425 |  |  |
Revolving Facility due April 2, 2018 |  |  |  |  |  |  |  |  |  |
Disclosure Basis Of Presentation Details [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | 48,000 |  |  | $ 48,000 |  |  | $ 0 |
Line of credit facility, maturity date |  |  |  |  |  | Apr. 02, 2018 |  |  |  |
Subsequent Event | Ms. Oprah Winfrey |  |  |  |  |  |  |  |  |  |
Disclosure Basis Of Presentation Details [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Investments | $ 43,199 |  |  |  |  |  |  |  |  |
Percentage of investments | 10.00% |  |  |  |  |  |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |  |  |
Disclosure Basis Of Presentation Details [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  | $ 1,160,000 |  |
Out-of-Period Adjustments |  |  |  |  |  |  |  |  |  |
Disclosure Basis Of Presentation Details [Line Items] |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  | $ 1,650 |  |  |  |  |  |
Net income attributable to Weight Watchers International, Inc. |  |  |  | $ 420 |  |  |  |  |  |
Debt Obligations Due April 2016 |  |  |  |  |  |  |  |  |  |
Disclosure Basis Of Presentation Details [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 144,323 |  |  | $ 144,323 |  |  |  |
Long-term debt, payment date |  |  |  |  |  | 2016-04 |  |  |  |

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