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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 47,028	$ 70,099	$ 90,019	$ 179,842
Other comprehensive (loss) gain:
Foreign currency translation (loss) gain	(2,983)	1,534	532	(5,695)
Income tax benefit (expense) on foreign currency translation (loss) gain	757	(390)	(135)	1,443
Foreign currency translation (loss) gain, net of taxes	(2,226)	1,144	397	(4,252)
(Loss) gain on derivatives	(4,251)	2,904	(22,431)	15,201
Income tax benefit (expense) on (loss) gain on derivatives	1,078	(736)	5,689	(3,855)
(Loss) gain on derivatives, net of taxes	(3,173)	2,168	(16,742)	11,346
Total other comprehensive (loss) gain	(5,399)	3,312	(16,345)	7,094
Comprehensive income	41,629	73,411	73,674	186,936
Net loss attributable to the noncontrolling interest	58	33	214	122
Foreign currency translation loss, net of taxes attributable to the noncontrolling interest	44	33	38	406
Comprehensive loss attributable to the noncontrolling interest	102	66	252	528
Comprehensive income attributable to WW International, Inc.	$ 41,731	$ 73,477	$ 73,926	$ 187,464

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