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Nature of business and summary of significant accounting policies - Property, plant, and equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Mar. 31, 2018
Property and equipment ,net:      
Cost capitalized in connection with the development of internally used software $ 5,890 $ 4,565 $ 4,397
Cost amortized in connection with the development of internally used software $ 4,977 $ 4,374 $ 4,346
Buildings      
Property and equipment ,net:      
Estimated useful lives 30 years    
Furniture, fixtures, and equipment | Minimum      
Property and equipment ,net:      
Estimated useful lives 3 years    
Furniture, fixtures, and equipment | Maximum      
Property and equipment ,net:      
Estimated useful lives 10 years    
Computer software | Minimum      
Property and equipment ,net:      
Estimated useful lives 2 years    
Computer software | Maximum      
Property and equipment ,net:      
Estimated useful lives 5 years