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Government grants - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 26, 2022
Mar. 27, 2021
Canadian emergency wage subsidy program [Member]    
Government Grants [Line Items]    
Proceeds from government grant $ 0.5 $ 1.4
Canadian emergency rent subsidy program [Member]    
Government Grants [Line Items]    
Proceeds from government grant 0.5 0.0
Accounts receivable [Member] | Canadian emergency wage subsidy program [Member]    
Government Grants [Line Items]    
Government grant receivable 0.0 0.4
Accounts receivable [Member] | Canadian emergency rent subsidy program [Member]    
Government Grants [Line Items]    
Government grant receivable 0.0 0.5
Selling general and administrative expenses [Member] | Canadian emergency wage subsidy program [Member]    
Government Grants [Line Items]    
Government grant recognized 0.5 1.4
Selling general and administrative expenses [Member] | Canadian emergency rent subsidy program [Member]    
Government Grants [Line Items]    
Government grant recognized $ 0.5 $ 0.5