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Segment and Geographic Information - Summary of Property and Equipment, Net by Geographical Region (Detail) - USD ($) $ in Thousands | Mar. 26, 2022 | Sep. 25, 2021 | Sep. 26, 2020
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Long Lived Assets By Geographic Areas [Line Items] |  |  |
Total property and equipment, net | $ 19,201 | $ 18,617 | $ 9,186
Percentage of property and equipment, net held outside of the United States | 6.00% | 7.00% | 13.00%
United States [Member] |  |  |
Long Lived Assets By Geographic Areas [Line Items] |  |  |
Total property and equipment, net | $ 18,085 | $ 17,355 | $ 7,978
Canada [Member] |  |  |
Long Lived Assets By Geographic Areas [Line Items] |  |  |
Total property and equipment, net | $ 1,116 | $ 1,262 | $ 1,208

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