Income Taxes - Unrecognized tax benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Jan. 01, 2022
Summary of the activity related to gross unrecognized tax benefits
Beginning balance	$ 4,109	$ 3,677	$ 2,853
Additions based on tax positions related to current year	737	872	830
Additions based on tax positions related to prior years	22
Reductions based on tax positions related to prior years		(6)	(6)
Reductions for tax positions as a result of a lapse of the applicable statute of limitations		(434)
Ending balance	4,868	4,109	3,677
Unrecognized tax benefits, other disclosures
Gross unrecognized tax benefits, inclusive of interest	5,400	4,400	3,900
Gross unrecognized tax benefits which would affect the effective tax rate if recognized	$ 5,100	$ 4,400	$ 3,900