Net Loss per Share - Schedule of Antidilutive Unvested RSUs Excluded from Computation of Net Loss per Share (Details) - Restricted Stock Units (RSUs) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
KKI
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of net loss per share	6,637	5,097
KK U.K.
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of net loss per share	7	7
Insomnia Cookies
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of net loss per share	0	0
KK Australia
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of net loss per share	185	276
KK Mexico
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of net loss per share	0	0