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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 70,684	$ 45,164	$ 109,742	$ 55,742
Other comprehensive (loss) gain:
Foreign currency translation (loss) gain	(3,804)	2,630	(7,229)	6,031
Income tax benefit (expense) on foreign currency translation (loss) gain	965	(1,026)	1,833	(2,352)
Foreign currency translation (loss) gain, net of taxes	(2,839)	1,604	(5,396)	3,679
Gain (loss) on derivatives	1,130	(1,136)	12,297	4,377
Income tax (expense) benefit on gain on derivatives	(287)	443	(3,119)	(1,707)
Gain (loss) on derivatives, net of taxes	843	(693)	9,178	2,670
Total other comprehensive (loss) gain	(1,996)	911	3,782	6,349
Comprehensive income	68,688	46,075	113,524	62,091
Net loss attributable to the noncontrolling interest	36	9	90	83
Foreign currency translation loss, net of taxes attributable to the noncontrolling interest	137	146	373	41
Comprehensive loss attributable to the noncontrolling interest	173	155	463	124
Comprehensive income attributable to Weight Watchers International, Inc.	$ 68,861	$ 46,230	$ 113,987	$ 62,215

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