CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2022	Jan. 02, 2021	Dec. 28, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 66,892	$ 75,041	$ 119,447
Other comprehensive gain (loss):
Foreign currency translation (loss) gain	(4,797)	10,088	3,676
Income tax benefit (expense) on foreign currency translation (loss) gain	1,206	(2,533)	(939)
Foreign currency translation (loss) gain, net of taxes	(3,591)	7,555	2,737
Gain (loss) on derivatives	13,539	(7,305)	(19,222)
Income tax (expense) benefit on gain (loss) on derivatives	(3,403)	1,855	4,868
Gain (loss) on derivatives, net of taxes	10,136	(5,450)	(14,354)
Total other comprehensive gain (loss)	6,545	2,105	(11,617)
Comprehensive income	73,437	77,146	107,830
Net loss attributable to the noncontrolling interest		38	169
Foreign currency translation loss, net of taxes attributable to the noncontrolling interest		98	22
Comprehensive loss attributable to the noncontrolling interest		136	191
Comprehensive income attributable to WW International, Inc.	$ 73,437	$ 77,282	$ 108,021