Share-based Compensation - Schedule of RSU Activity (Details) shares in Thousands	9 Months Ended
	Sep. 29, 2024 $ / shares shares
Restricted Stock Units (RSUs) | KK U.K.
RSUs and PSUs
Beginning balance, non-vested shares outstanding (in shares) | shares	7
Granted (in shares) | shares	0
Vested (in shares) | shares	0
Forfeited (in shares) | shares	0
Ending balance, non-vested shares outstanding (in shares) | shares	7
Weighted Average Grant Date Fair Value
Beginning balance, non-vested shares outstanding (in USD per share) | $ / shares	$ 29.80
Granted, weighted average grant date fair value (in USD per share) | $ / shares	0
Vested, weighted average grant date fair value (in USD per share) | $ / shares	0
Forfeited, weighted average grant date fair value (in USD per share) | $ / shares	0
Ending balance, non-vested shares outstanding (in USD per share) | $ / shares	$ 29.80
Restricted Stock Units (RSUs) | KK Australia
RSUs and PSUs
Beginning balance, non-vested shares outstanding (in shares) | shares	185
Granted (in shares) | shares	0
Vested (in shares) | shares	22
Forfeited (in shares) | shares	0
Ending balance, non-vested shares outstanding (in shares) | shares	163
Weighted Average Grant Date Fair Value
Beginning balance, non-vested shares outstanding (in USD per share) | $ / shares	$ 1.57
Granted, weighted average grant date fair value (in USD per share) | $ / shares	0
Vested, weighted average grant date fair value (in USD per share) | $ / shares	1.61
Forfeited, weighted average grant date fair value (in USD per share) | $ / shares	0
Ending balance, non-vested shares outstanding (in USD per share) | $ / shares	$ 1.57
Restricted Stock Units (RSUs) | KK Mexico
RSUs and PSUs
Beginning balance, non-vested shares outstanding (in shares) | shares	20
Granted (in shares) | shares	0
Vested (in shares) | shares	2
Forfeited (in shares) | shares	0
Ending balance, non-vested shares outstanding (in shares) | shares	18
Weighted Average Grant Date Fair Value
Beginning balance, non-vested shares outstanding (in USD per share) | $ / shares	$ 30.18
Granted, weighted average grant date fair value (in USD per share) | $ / shares	0
Vested, weighted average grant date fair value (in USD per share) | $ / shares	29.21
Forfeited, weighted average grant date fair value (in USD per share) | $ / shares	0
Ending balance, non-vested shares outstanding (in USD per share) | $ / shares	$ 30.01
Restricted Stock Units (RSUs) and Performance Stock Units (PSUs) | KKI
RSUs and PSUs
Beginning balance, non-vested shares outstanding (in shares) | shares	6,785
Granted (in shares) | shares	1,738
Vested (in shares) | shares	1,524
Forfeited (in shares) | shares	388
Ending balance, non-vested shares outstanding (in shares) | shares	6,611
Weighted Average Grant Date Fair Value
Beginning balance, non-vested shares outstanding (in USD per share) | $ / shares	$ 14.54
Granted, weighted average grant date fair value (in USD per share) | $ / shares	14.53
Vested, weighted average grant date fair value (in USD per share) | $ / shares	14.93
Forfeited, weighted average grant date fair value (in USD per share) | $ / shares	15.00
Ending balance, non-vested shares outstanding (in USD per share) | $ / shares	$ 14.53