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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 223,568	$ 163,317	$ 67,493
Other comprehensive (loss) gain:
Foreign currency translation (loss) gain	(11,462)	9,848	5,556
Income tax benefit (expense) on foreign currency translation (loss) gain	2,906	(3,840)	(2,089)
Foreign currency translation (loss) gain, net of taxes	(8,556)	6,008	3,467
Gain on derivatives	7,205	17,393	11,821
Income tax expense on gain on derivatives	(1,827)	(6,783)	(4,688)
Gain on derivatives, net of taxes	5,378	10,610	7,133
Total other comprehensive (loss) gain	(3,178)	16,618	10,600
Comprehensive income	220,390	179,935	78,093
Net loss attributable to the noncontrolling interest	181	197	206
Foreign currency translation loss (gain), net of taxes attributable to the noncontrolling interest	373	35	(455)
Comprehensive loss (income) attributable to the noncontrolling interest	554	232	(249)
Comprehensive income attributable to Weight Watchers International, Inc.	$ 220,944	$ 180,167	$ 77,844

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