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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