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Property and Equipment - Schedule Of Property Plant And Equipment (Detail) - USD ($)
$ in Thousands
Mar. 26, 2022
Sep. 25, 2021
Sep. 26, 2020
Property, Plant and Equipment [Line Items]      
Property and equipment $ 40,346 $ 37,177 $ 36,001
Less accumulated depreciation (21,145) (18,560) (26,815)
Property and equipment, net 19,201 18,617 9,186
Computer Equipment And Software Furniture And Fixtures And Test Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment 37,427 34,268 33,276
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment $ 2,919 $ 2,909 $ 2,725