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Income Taxes - Summary of reconciliation of the expected U.S. federal income tax rate to the effective tax rate (Detail) - USD ($) | 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 | Sep. 28, 2019
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |
Loss before income tax | $ (29,903,000) | $ (26,855,000) | $ (52,956,000) | $ (53,058,000) | $ (122,314,000) | $ (109,568,000) | $ (104,361,000) |
Tax on pre-tax loss |  |  |  |  | (25,686,000) |  |  |
Loss not subject to tax |  |  |  |  | 26,575,000 |  |  |
Foreign rate differential |  |  |  |  | 233,000 |  |  |
Decrease in valuation allowance |  |  |  |  | (993,000) |  |  |
Other |  |  |  |  | (129,000) |  |  |
Total income tax | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (47,000) | $ 0 | $ 0
Tax on pre-tax loss Percent |  |  |  |  | 21.00% |  |  |
Loss not subject to tax Percent |  |  |  |  | (21.73%) |  |  |
Foreign rate differential Percent |  |  |  |  | (0.19%) |  |  |
Decrease in valuation allowance Percent |  |  |  |  | 0.81% |  |  |
Other Percent |  |  |  |  | 0.11% |  |  |
Total income tax Percent |  |  |  |  | 0.00% |  |  |

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