Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Postemployment Benefits [Abstract]
Employer matching contribution	100.00%
Maximum percentage of participant's compensation for employer contribution	4.00%
Participant's vesting percentage in Company's contributions	100.00%
Amount contributed by the Company and KAR	$ 4.5	$ 4.3	$ 3.7