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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2015 | Dec. 31, 2016 | Jan. 02, 2016 | Dec. 31, 2015 | Jan. 03, 2015
Disclosure Basis Of Presentation Details [Line Items] |  |  |  |  |  |  |
Income before income taxes |  |  |  | $ 84,127 | $ 55,614 |  | $ 183,664
Net income attributable to Weight Watchers International, Inc. |  |  |  | 67,699 | 32,945 |  | 117,787
Provision for income taxes |  |  |  | 16,634 | 22,835 |  | $ 65,931
Adjustments |  |  |  |  |  |  |
Disclosure Basis Of Presentation Details [Line Items] |  |  |  |  |  |  |
Income before income taxes |  |  |  | 347 | 1,650 |  |
Net income attributable to Weight Watchers International, Inc. | $ 1,576 | $ (2,684) | $ 420 | (1,791) | 320 | $ (740) |
Provision for income taxes | $ (110) | $ 2,684 |  | $ 2,138 | $ 1,970 |  |

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