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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 25, 2021
Sep. 26, 2020
Finite-Lived Intangible Assets [Line Items]    
Intangibles, gross $ 5,438 $ 5,139
Accumulated amortization (4,274) (3,599)
Intangibles, net 1,164 1,540
Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangibles, gross 4,656 4,400
Accumulated amortization (3,492) (2,860)
Intangibles, net 1,164 1,540
Trademarks [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangibles, gross 782 739
Accumulated amortization (782) (739)
Intangibles, net $ 0 $ 0