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Long-term debt - Summary of Long Term Debt (Parenthetical) (Detail) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 12, 2021 | Jul. 08, 2020 | Mar. 25, 2023 | Mar. 26, 2022
Finance Lease Obligations [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument Interest Rate Stated Percentage Rate |  |  | 2.20% | 2.20%
Finance Lease Obligations [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument Interest Rate Stated Percentage Rate |  |  | 3.90% | 3.90%
Investissement Québec [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument Interest Rate Stated Percentage Rate |  | 3.14% | 3.14% |
Long-term debt |  | $ 10,000,000 | $ 10,000,000 |
Repayment of debt term |  | 60 months | 60 months |
Deferred financing costs |  |  | $ 8,000,000 | $ 20,000,000
Term loan From Business Development Bank of Canada [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument Interest Rate Stated Percentage Rate | 8.30% |  |  |
Long-term debt |  |  | $ 303,000 | $ 374,000
Repayment of debt term | 72 months |  |  |
Debt Instrument, Face Amount | $ 400,000 |  |  |
Debt instrument first required payment month year | 2021-05 |  |  |
Loan From Investment Of Quebec Annual Interest Rate One Point Four one Percent [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument Interest Rate Stated Percentage Rate |  |  | 1.41% |
Repayment of debt term |  |  | 60 months |
Deferred financing costs |  |  | $ 56,000 |
Debt Instrument, Face Amount |  |  | $ 4,300,000 |
Debt instrument first required payment month year |  |  | 2027-06 |
Cash Contribution one [Member] | Montel [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest on Cash advances |  |  | 11.00% | 11.00%
Cash received from related party |  |  | $ 1,500,000 | $ 1,500,000
Long-term debt |  |  | $ 2,064,000 | 1,875,000
Term Loan Facility Repayable At October Two Thousand Twenty Two [Member] | Term Loan From SLR Credit Solutions CDOR Plus Eight Point Two Five Percent [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument Interest Rate Stated Percentage Rate |  |  | 7.75% |
Net of deferred financing costs |  |  | $ 247,000 | 314,000
Long-term debt |  |  | $ 12,253,000 | $ 12,186,000

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