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Inventories - Schedule Of Inventory Current (Detail) - USD ($)
$ in Thousands
Mar. 26, 2022
Sep. 25, 2021
Sep. 26, 2020
Inventory [Line Items]      
Raw materials and components $ 66,102 $ 33,065 $ 16,144
Finished goods 6,237 496 310
Total inventories $ 72,339 $ 33,561 $ 16,454