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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