Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 24, 2022	Sep. 25, 2021
Deferred tax assets [Abstract]
Net operating loss carryforwards	$ 39,355	$ 37,806
Allowance for doubtful accounts	368	208
Inventory	418	264
Deferred revenue	526	557
Other accruals	2,391	2,671
Total deferred tax assets	43,058	41,506
Deferred tax liabilities [Abstract]
Intangible assets	1,191	1,189
Property, plant and equipment	1,393	1,655
Total deferred tax liabilities	2,584	2,844
Net deferred tax assets	40,474	38,662
Valuation allowance	(39,442)	(38,268)
Net deferred tax assets	$ 1,032	$ 394