Long-Term Debt - Schedule of Long-term debt and short-term borrowings (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 28, 2023	Dec. 29, 2022
Debt Disclosure [Abstract]
Principal and interest payments	$ 39	$ 39
Interest rate of unsecured term note (as percent)	5.75%	5.75%
Senior notes	$ 70,000	$ 80,000
Unsecured term note due February 2025, with monthly principal and interest payments of $39, bearing interest at 5.75%	637	954
Convertible senior notes	100,050	100,050
Payroll Protection Program loans	1,460	2,240
Revolving credit agreement	0	0
Debt issuance costs	(2,055)	(2,807)
Total debt, net of debt issuance costs	170,092	180,437
Less current maturities, net of issuance costs	10,411	10,432
Long-term debt	$ 159,681	$ 170,005