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Information About Reportable Segments (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 29, 2017 | Dec. 29, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  | $ 330,386 | $ 365,765 | $ 409,747 | $ 408,223 | $ 312,488 | $ 323,687 | $ 341,673 | $ 329,063 | $ 1,514,121 | $ 1,306,911 | $ 1,164,902
Operating income |  | 80,347 | 118,860 | 127,708 | 62,073 | 49,488 | 91,378 | 96,206 | 30,233 | 388,985 | 267,305 | 200,811
Interest expense |  |  |  |  |  |  |  |  |  | 142,346 | 112,784 | 115,160
Other expense, net |  |  |  |  |  |  |  |  |  | 2,578 | 472 | 1,524
Early extinguishment of debt, net | $ 10,524 |  |  |  |  |  |  |  |  | 0 | 8,969 | 0
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  |  | 20,493 | (18,237) | 16,634
Net income |  | $ 43,785 | $ 70,132 | $ 70,720 | $ 39,112 | $ 62,969 | $ 44,719 | $ 45,173 | $ 10,653 | 223,568 | 163,317 | 67,493
Net loss attributable to the noncontrolling interest |  |  |  |  |  |  |  |  |  | 181 | 197 | 206
Net income attributable to Weight Watchers International, Inc. |  |  |  |  |  |  |  |  |  | 223,749 | 163,514 | 67,699
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 52,600 | 56,992 | 58,749
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  |  | 494,725 | 336,857 | 249,398
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 40,568 | 42,535 | 45,125
General corporate expenses |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
General corporate expenses |  |  |  |  |  |  |  |  |  | 105,740 | 69,552 | 48,587
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 12,032 | 14,457 | 13,624
North America |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 1,047,251 | 910,349 | 798,827
North America | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  |  | 351,599 | 247,587 | 175,290
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 37,137 | 39,501 | 41,718
United Kingdom |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 107,072 | 99,989 | 100,808
United Kingdom | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  |  | 18,814 | 19,939 | 14,199
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 1,487 | 1,205 | 971
Continental Europe |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 304,325 | 239,223 | 210,590
Continental Europe | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  |  | 114,708 | 73,689 | 51,096
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 1,347 | 1,203 | 1,621
Other |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 55,473 | 57,350 | 54,677
Other | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  |  | 9,604 | (4,358) | 8,813
Depreciation and amortization |  |  |  |  |  |  |  |  |  | $ 597 | $ 626 | $ 815

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