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Quarterly Financial Information - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Jan. 02, 2016 | Oct. 03, 2015 | Jul. 04, 2015 | Apr. 04, 2015 | Jun. 29, 2013 | Jul. 02, 2015 | Dec. 31, 2016 | Jan. 02, 2016 | Dec. 31, 2015 | Jan. 03, 2015
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Weight Watchers International, Inc. |  |  |  |  |  |  |  |  |  |  | $ 67,699 | $ 32,945 |  | $ 117,787
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  |  |  | $ 16,634 | $ 22,835 |  | $ 65,931
Earning Per share fully diluted | $ 0.20 | $ 0.53 | $ 0.46 | $ (0.17) | $ (0.18) | $ 0.38 | $ 0.49 | $ (0.10) |  |  | $ 1.03 | $ 0.56 |  | $ 2.08
Operating income | $ 46,730 | $ 66,792 | $ 73,731 | $ 13,557 | $ 16,326 | $ 63,108 | $ 70,580 | $ 18,044 |  |  | $ 200,811 | $ 168,058 |  | $ 299,314
Employee termination benefit costs, pretax |  |  |  |  | 1,338 | 1,081 | 232 | 5,761 |  |  |  |  |  |
Employee termination benefit costs, after tax |  |  |  |  | 815 | $ 660 | 142 | 3,514 |  |  |  | 5,131 |  | 7,222
Impact of early extinguishment of debt on net income before of tax |  |  |  |  |  |  | 6,727 | 4,749 | $ 21,685 |  | 0 | 11,426 |  | $ 0
Impact of early extinguishment of debt on net income net of tax |  |  |  |  |  |  | $ 4,103 | $ 2,897 |  |  |  |  |  |
Impact of early extinguishment of debt per fully diluted share |  |  |  |  |  |  | $ 0.07 | $ 0.05 |  |  |  |  |  |
Research and development tax credit and Section 199 deduction for the tax years 2012 through 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision (benefit) for income taxes |  | $ (11,438) |  |  |  |  |  |  |  |  |  |  |  |
Earning Per share fully diluted |  | $ 0.17 |  |  |  |  |  |  |  |  |  |  |  |
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. | 1,576 | $ (2,684) |  |  |  |  |  |  |  | $ 420 | (1,791) | 320 | $ (740) |
Provision (benefit) for income taxes | $ (110) | $ 2,684 |  |  |  |  |  |  |  |  | $ 2,138 | $ 1,970 |  |
Earning Per share fully diluted | $ 0.02 | $ (0.04) |  |  |  |  |  |  |  |  |  |  |  |
Operating income | $ 1,466 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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