Income taxes - Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Jan. 03, 2026	Dec. 28, 2024
Deferred tax assets:
NOL carry-forwards	$ 6,454	$ 8,017
Credit carryforwards	289	274
Deferred revenue	6,126	5,999
Accrued expenses and reserves	12,425	13,811
Loss on equity and other investments	878	886
Stock-based compensation	7,936	6,191
Operating lease liabilities	114,237	120,990
Subtotal	148,345	156,168
Valuation allowances	(5,458)	(5,961)
Total net deferred tax assets	142,887	150,207
Deferred tax liabilities:
Depreciation of property and equipment	(58,634)	(57,150)
Amortization of intangible assets	(65,051)	(65,168)
Right of use asset	(98,716)	(102,446)
Other	(3,058)	(3,352)
Total deferred tax liabilities	(225,459)	(228,116)
Net deferred tax liabilities	$ (82,572)	$ (77,909)