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Information About Reportable Segments (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Nov. 29, 2017 | Jun. 30, 2018 | Dec. 30, 2017 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenue |  | $ 409,747 |  | $ 341,673 | $ 817,970 | $ 670,736
Operating income |  | 127,708 |  | 96,206 | 189,779 | 126,440
Interest expense |  | 35,866 |  | 27,092 | 71,732 | 55,234
Other expense (income), net |  | 1,333 |  | (488) | 1,097 | 154
Gain on early extinguishment of debt | $ 10,524 | 0 |  | (1,554) | 0 | (1,554)
Provision for income taxes |  | 19,825 | $ 56,560 | 25,992 | 7,208 | 16,864
Net income |  | 70,684 |  | 45,164 | 109,742 | 55,742
Net loss attributable to the noncontrolling interest |  | 36 |  | 9 | 90 | 83
Net income attributable to Weight Watchers International, Inc. |  | 70,720 |  | 45,173 | 109,832 | 55,825
Depreciation and amortization |  | 12,828 |  | 14,068 | 25,896 | 28,415
Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating income |  | 154,005 |  | 111,775 | 239,742 | 155,198
Depreciation and amortization |  | 9,994 |  | 10,512 | 20,284 | 21,372
General corporate expenses |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
General corporate expenses |  | 26,297 |  | 15,569 | 49,963 | 28,758
Depreciation and amortization |  | 2,834 |  | 3,556 | 5,612 | 7,043
North America |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenue |  | 284,538 |  | 238,989 | 563,715 | 471,719
North America | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating income |  | 112,040 |  | 79,073 | 174,393 | 113,189
Depreciation and amortization |  | 9,163 |  | 9,738 | 18,642 | 19,868
United Kingdom |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenue |  | 29,210 |  | 26,435 | 59,495 | 50,434
United Kingdom | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating income |  | 6,035 |  | 6,672 | 9,903 | 9,245
Depreciation and amortization |  | 350 |  | 346 | 715 | 628
Continental Europe |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenue |  | 81,592 |  | 61,496 | 164,123 | 118,914
Continental Europe | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating income |  | 32,478 |  | 22,767 | 50,409 | 27,823
Depreciation and amortization |  | 317 |  | 292 | 618 | 601
Other |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenue |  | 14,407 |  | 14,753 | 30,637 | 29,669
Other | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating income |  | 3,452 |  | 3,263 | 5,037 | 4,941
Depreciation and amortization |  | $ 164 |  | $ 136 | $ 309 | $ 275

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