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Property and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 26, 2022
Mar. 27, 2021
Mar. 26, 2022
Mar. 27, 2021
Sep. 25, 2021
Sep. 26, 2020
Sep. 28, 2019
Property, Plant and Equipment [Abstract]              
Depreciation expense $ 1.3 $ 0.8 $ 2.5 $ 1.6 $ 4.0 $ 5.3 $ 6.9