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Information About Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2017 | Jul. 02, 2016 | Jun. 29, 2013 | Jul. 01, 2017 | Jul. 02, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenue | $ 341,673 | $ 309,761 |  | $ 670,736 | $ 616,671
Operating income | 96,206 | 73,731 |  | 126,440 | 87,287
Interest expense | 27,092 | 28,609 |  | 55,234 | 58,634
Other (income) expense, net | (488) | 607 |  | 154 | 542
Gain on early extinguishment of debt | (1,554) | 0 | $ (21,685) | (1,554) | 0
Provision for income taxes | 25,992 | 14,034 |  | 16,864 | 8,431
Net income | 45,164 | 30,481 |  | 55,742 | 19,680
Net loss attributable to the noncontrolling interest | 9 | 13 |  | 83 | 61
Net income attributable to Weight Watchers International, Inc. | 45,173 | 30,494 |  | 55,825 | 19,741
Depreciation and amortization | 14,068 | 14,392 |  | 28,415 | 28,923
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income | 111,775 | 84,359 |  | 155,198 | 112,257
Depreciation and amortization | 10,512 | 11,791 |  | 21,372 | 23,649
General corporate expenses |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
General corporate expenses | 15,569 | 10,628 |  | 28,758 | 24,970
Depreciation and amortization | 3,556 | 2,601 |  | 7,043 | 5,274
North America |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenue | 238,989 | 211,545 |  | 471,719 | 420,388
North America | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income | 79,073 | 56,975 |  | 113,189 | 82,499
Depreciation and amortization | 9,738 | 10,894 |  | 19,868 | 21,779
United Kingdom Segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenue | 26,435 | 27,702 |  | 50,434 | 56,613
United Kingdom Segment | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income | 6,672 | 5,506 |  | 9,245 | 5,915
Depreciation and amortization | 346 | 299 |  | 628 | 517
Continental Europe |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenue | 61,496 | 57,048 |  | 118,914 | 112,754
Continental Europe | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income | 22,767 | 19,523 |  | 27,823 | 20,729
Depreciation and amortization | 292 | 428 |  | 601 | 884
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenue | 14,753 | 13,466 |  | 29,669 | 26,916
Other | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income | 3,263 | 2,355 |  | 4,941 | 3,114
Depreciation and amortization | $ 136 | $ 170 |  | $ 275 | $ 469

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