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Net Loss per Share - Schedule of Antidilutive Unvested RSUs Excluded from Computation of Net Loss per Share (Details) - Restricted Stock Units (RSUs) - shares
3 Months Ended 9 Months Ended
Sep. 28, 2025
Sep. 29, 2024
Sep. 28, 2025
Sep. 29, 2024
KKI        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of net loss per share 10,953,000 2,807,000 10,953,000 2,807,000
KK U.K.        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of net loss per share 0 7,000 0 7,000
KK Australia        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of net loss per share 0 0 74,000 0
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 0 0