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Information About Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | $ 369,023 | $ 409,747 | $ 732,188 | $ 817,970
Operating income | 105,473 | 127,708 | 127,371 | 189,779
Interest expense | 34,732 | 35,866 | 69,927 | 71,732
Other expense, net | 438 | 1,333 | 741 | 1,097
Provision for income taxes | 16,586 | 19,825 | 13,711 | 7,208
Net income | 53,717 | 70,684 | 42,992 | 109,742
Net loss attributable to the noncontrolling interest | 117 | 36 | 156 | 90
Net income attributable to Weight Watchers International, Inc. | 53,834 | 70,720 | 43,148 | 109,832
Depreciation and amortization | 13,759 | 12,828 | 27,373 | 25,896
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | 127,967 | 154,005 | 178,074 | 239,742
Depreciation and amortization | 9,722 | 9,994 | 19,805 | 20,284
General corporate expenses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
General corporate expenses | 22,494 | 26,297 | 50,703 | 49,963
Depreciation and amortization | 4,037 | 2,834 | 7,568 | 5,612
North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 255,644 | 284,538 | 505,656 | 563,715
North America | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | 91,169 | 112,040 | 132,282 | 174,393
Depreciation and amortization | 9,081 | 9,163 | 18,386 | 18,642
Continental Europe |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 77,329 | 81,592 | 153,486 | 164,123
Continental Europe | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | 30,764 | 32,478 | 40,839 | 50,409
Depreciation and amortization | 395 | 317 | 776 | 618
United Kingdom |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 24,525 | 29,210 | 49,136 | 59,495
United Kingdom | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | 4,308 | 6,035 | 3,557 | 9,903
Depreciation and amortization | 139 | 350 | 425 | 715
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 11,525 | 14,407 | 23,910 | 30,637
Other | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income | 1,726 | 3,452 | 1,396 | 5,037
Depreciation and amortization | $ 107 | $ 164 | $ 218 | $ 309

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