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Information About Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Apr. 01, 2017 | Apr. 01, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenue | $ 408,223 | $ 408,223 |  | $ 329,063 | $ 329,063
Operating income |  | 62,073 |  |  | 30,233
Interest expense |  | 35,866 |  |  | 28,142
Other (income) expense, net |  | (235) |  |  | 640
Benefit from income taxes |  | (12,617) | $ 56,560 |  | (9,128)
Net income |  | 39,059 |  |  | 10,579
Net loss attributable to the noncontrolling interest |  | 53 |  |  | 74
Net income attributable to Weight Watchers International, Inc. |  | 39,112 |  |  | 10,653
Depreciation and amortization |  | 13,068 |  |  | 14,347
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 85,738 |  |  | 43,424
Depreciation and amortization |  | 10,291 |  |  | 10,861
General corporate expenses |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
General corporate expenses |  | 23,665 |  |  | 13,191
Depreciation and amortization |  | 2,777 |  |  | 3,486
North America |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenue | 279,179 |  |  | 232,731 |
North America | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 62,353 |  |  | 34,116
Depreciation and amortization |  | 9,480 |  |  | 10,132
United Kingdom |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenue | 30,284 |  |  | 23,998 |
United Kingdom | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 3,868 |  |  | 2,572
Depreciation and amortization |  | 366 |  |  | 282
Continental Europe |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenue | 82,531 |  |  | 57,416 |
Continental Europe | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 17,930 |  |  | 5,056
Depreciation and amortization |  | 301 |  |  | 310
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenue | $ 16,229 |  |  | $ 14,918 |
Other | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 1,587 |  |  | 1,680
Depreciation and amortization |  | $ 144 |  |  | $ 137

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