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Quarterly Financial Information - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 02, 2016 | Oct. 03, 2015 | Jul. 04, 2015 | Apr. 04, 2015 | Jan. 03, 2015 | Sep. 27, 2014 | Jul. 28, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Jun. 29, 2013 | Jan. 02, 2016 | Jan. 03, 2015 | Dec. 28, 2013
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Employee termination benefit costs, pretax | $ 1,338 | $ 1,081 | $ 232 | $ 5,761 | $ 973 | $ 713 |  | $ 6,498 | $ 3,656 |  | $ 8,412 | $ 11,840 |
Employee termination benefit costs, after tax | 815 | $ 660 | 142 | 3,514 | $ 593 | $ 430 |  | $ 3,964 | 2,235 |  | 5,131 | 7,222 |
Impact of early extinguishment of debt on net income before of tax |  |  | 6,727 | 4,749 |  |  | $ 2,350 |  | 10,540 | $ 21,685 | 11,426 | 0 | $ (21,685)
Impact of early extinguishment of debt on net income net of tax |  |  | $ 4,103 | $ 2,897 |  |  |  |  | $ 6,396 |  |  |  |
Impact of early extinguishment of debt per fully diluted share |  |  | $ 0.07 | $ 0.05 |  |  | $ 0.04 |  | $ 0.11 |  |  |  |
Net income attributable to Weight Watchers International, Inc. |  |  |  |  |  |  |  |  |  |  | 32,945 | $ 117,787 | $ 202,742
Ms. Winfrey |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impact of related party transaction expense on net income before of tax |  |  |  |  |  |  |  |  |  |  | 13,593 |  |
Impact of related party transaction expense on net income net of tax |  |  |  |  |  |  |  |  |  |  | $ 8,292 |  |
Impact of related party transaction expense per fully diluted share |  |  |  |  |  |  |  |  |  |  | $ 0.13 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Weight Watchers International, Inc. | $ 410 |  | $ 420 |  |  |  |  |  |  |  | $ 320 |  |

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- Definition The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6401765&loc=d3e13305-112630 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 + Details
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