Income taxes - Schedule of Reconciliation of Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2026	Dec. 28, 2024	Dec. 30, 2023
Income Tax Disclosure [Abstract]
Earnings (loss) from continuing operations before income taxes	$ 41,681	$ (25,684)	$ 9,552
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal income tax provision at statutory rate	8,753	(5,394)	2,006
State income tax provision, net of federal income tax	2,422	895	1,686
Work opportunity tax credit	(899)	(747)	(1,143)
Increase (decrease) in deferred tax asset valuation allowance	(912)	(1,272)	2,238
Executive compensation limitation	623	994	354
Goodwill impairment	0	3,539	0
Tax provision (benefit) of equity-based compensation deductions	876	1,240	1,133
Meals and entertainment	327	369	433
Other	14	(22)	(64)
Net operating loss limitation	467	0	0
Other, net	410	1,879	(637)
Income tax provision (benefit) from continuing operations	$ 12,081	$ 1,481	$ 6,006
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal income tax provision at statutory rate (percent)	21.00%	21.00%	21.00%
State income tax provision, net of federal income tax (percent)	5.80%	(3.50%)	17.70%
Work opportunity tax credit (percent)	(2.20%)	2.90%	(12.00%)
Increase (decrease) in deferred tax asset valuation allowance (percent)	(2.20%)	5.00%	23.40%
Executive compensation limitation (percent)	1.50%	(3.90%)	3.70%
Goodwill impairment (percent)	0.00%	(13.80%)	0.00%
Tax provision (benefit) of equity-based compensation deductions (percent)	2.10%	(4.80%)	11.90%
Meals and entertainment (percent)	0.80%	(1.40%)	4.50%
Other (percent)	0.00%	0.10%	(0.70%)
Net operating loss limitation (percent)	1.10%	0.00%	0.00%
Other, net (percent)	1.10%	(7.40%)	(6.60%)
Effective income tax rate (percent)	29.00%	(5.80%)	62.90%