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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

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