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Information About Reportable Segments (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Jun. 29, 2013
Sep. 30, 2017
Oct. 01, 2016
Segment Reporting Information [Line Items]          
Net revenue $ 323,687 $ 280,819   $ 994,422 $ 897,490
Operating income 91,378 66,792   217,817 154,081
Interest expense 26,993 28,329   82,227 86,963
Other expense (income), net 125 (146)   278 397
Gain on early extinguishment of debt 0 0 $ (21,685) (1,554) 0
Provision for income taxes 19,593 3,989   36,457 12,420
Net income 44,667 34,620   100,409 54,301
Net loss attributable to the noncontrolling interest 52 38   135 99
Net income attributable to Weight Watchers International, Inc. 44,719 34,658   100,544 54,400
Depreciation and amortization 14,208 14,852   42,623 43,776
Operating Segments          
Segment Reporting Information [Line Items]          
Operating income 110,744 77,348   265,943 189,606
Depreciation and amortization 10,516 10,724   31,888 34,371
General corporate expenses          
Segment Reporting Information [Line Items]          
General corporate expenses 19,366 10,556   48,126 35,525
Depreciation and amortization 3,692 4,128   10,735 9,405
North America          
Segment Reporting Information [Line Items]          
Net revenue 223,677 192,899   695,397 613,287
North America | Operating Segments          
Segment Reporting Information [Line Items]          
Operating income 76,206 50,614   189,397 133,113
Depreciation and amortization 9,764 9,917   29,632 31,694
United Kingdom Segment          
Segment Reporting Information [Line Items]          
Net revenue 25,473 23,480   75,907 80,093
United Kingdom Segment | Operating Segments          
Segment Reporting Information [Line Items]          
Operating income 5,968 4,864   15,213 10,780
Depreciation and amortization 259 229   887 746
Continental Europe          
Segment Reporting Information [Line Items]          
Net revenue 60,665 50,675   179,580 163,429
Continental Europe | Operating Segments          
Segment Reporting Information [Line Items]          
Operating income 27,097 18,872   54,920 39,602
Depreciation and amortization 306 397   907 1,281
Other          
Segment Reporting Information [Line Items]          
Net revenue 13,872 13,765   43,538 40,681
Other | Operating Segments          
Segment Reporting Information [Line Items]          
Operating income 1,473 2,998   6,413 6,111
Depreciation and amortization $ 187 $ 181   $ 462 $ 650