Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 25, 2022	Sep. 25, 2021
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 42,858	$ 37,177
Less: Accumulated depreciation	(22,348)	(18,560)
Property and equipment, net	20,510	18,617
Computer equipment and software, furniture and fixtures, and test equipment
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	39,940	34,268
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 2,918	$ 2,909