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Commitments and Contingencies - Summary of Warranty Accrual (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 26, 2022
Mar. 27, 2021
Mar. 26, 2022
Sep. 25, 2021
Sep. 26, 2020
Sep. 28, 2019
Commitments and Contingencies Disclosure [Abstract]            
Balance at beginning of period $ 3,970 $ 0 $ 3,735 $ 450
Provision 452 0 1,373 4,652 1,750
Warranty usage (32) 0 (718) (917) (450) (1,300)
Balance at end of period $ 4,390 $ 0 $ 4,390 $ 3,735 $ 450