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Government grants - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Mar. 25, 2023
Mar. 26, 2022
Mar. 27, 2021
Canadian emergency wage subsidy program [Member]      
Government Grants [Line Items]      
Proceeds from government grant   $ 0.5  
Canadian emergency rent subsidy program [Member]      
Government Grants [Line Items]      
Proceeds from government grant   0.5  
Accounts receivable [Member] | Canadian emergency wage subsidy program [Member]      
Government Grants [Line Items]      
Government grant receivable $ 0.0 0.0  
Accounts receivable [Member] | Canadian emergency rent subsidy program [Member]      
Government Grants [Line Items]      
Government grant receivable 0.0 0.0  
Selling general and administrative expenses [Member] | Canadian emergency wage subsidy program [Member]      
Government Grants [Line Items]      
Government grant recognized 0.0 0.5 $ 1.4
Selling general and administrative expenses [Member] | Canadian emergency rent subsidy program [Member]      
Government Grants [Line Items]      
Government grant recognized $ 0.0 $ 0.5 $ 0.5