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Information About Reportable Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2018
Dec. 30, 2017
Apr. 01, 2017
Apr. 01, 2017
Segment Reporting Information [Line Items]          
Net revenue $ 408,223 $ 408,223   $ 329,063 $ 329,063
Operating income   62,073     30,233
Interest expense   35,866     28,142
Other (income) expense, net   (235)     640
Benefit from income taxes   (12,617) $ 56,560   (9,128)
Net income   39,059     10,579
Net loss attributable to the noncontrolling interest   53     74
Net income attributable to Weight Watchers International, Inc.   39,112     10,653
Depreciation and amortization   13,068     14,347
Operating Segments          
Segment Reporting Information [Line Items]          
Operating income   85,738     43,424
Depreciation and amortization   10,291     10,861
General corporate expenses          
Segment Reporting Information [Line Items]          
General corporate expenses   23,665     13,191
Depreciation and amortization   2,777     3,486
North America          
Segment Reporting Information [Line Items]          
Net revenue 279,179     232,731  
North America | Operating Segments          
Segment Reporting Information [Line Items]          
Operating income   62,353     34,116
Depreciation and amortization   9,480     10,132
United Kingdom          
Segment Reporting Information [Line Items]          
Net revenue 30,284     23,998  
United Kingdom | Operating Segments          
Segment Reporting Information [Line Items]          
Operating income   3,868     2,572
Depreciation and amortization   366     282
Continental Europe          
Segment Reporting Information [Line Items]          
Net revenue 82,531     57,416  
Continental Europe | Operating Segments          
Segment Reporting Information [Line Items]          
Operating income   17,930     5,056
Depreciation and amortization   301     310
Other          
Segment Reporting Information [Line Items]          
Net revenue $ 16,229     $ 14,918  
Other | Operating Segments          
Segment Reporting Information [Line Items]          
Operating income   1,587     1,680
Depreciation and amortization   $ 144     $ 137