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Income taxes - Operating loss carryovers (Details) - USD ($)
$ in Thousands
Apr. 02, 2022
Apr. 03, 2021
Mar. 28, 2020
Operating loss carryovers      
Valuation allowances $ 2,051 $ 2,223 $ 2,223
Foreign and Domestic      
Operating loss carryovers      
Tax credits 551 779  
Foreign and State      
Operating loss carryovers      
Deferred tax assets for net operating loss carryovers $ 2,231 $ 2,408