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Significant Accounting Policies - Basic and Diluted Earnings Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 27, 2021
Mar. 28, 2020
Mar. 30, 2019
Numerator:      
Net (loss) income $ (5,838) $ (12,779) $ (18,686)
Net loss from continuing operations $ (5,838) $ (12,227) $ (18,305)
Denominator:      
Weighted-average common shares outstanding 18,005 17,968 17,961
(Loss) income per common share $ (0.32) $ (0.71) $ (1.04)
Loss from continuing operations per common share $ (0.32) $ (0.68) $ (1.02)
Numerator:      
Net (loss) income $ (5,838) $ (12,779) $ (18,686)
Net loss from continuing operations $ (5,838) $ (12,227) $ (18,305)
Denominator:      
Weighted-average common shares outstanding 18,005 17,968 17,961
Dilutive effect of stock options and warrants    
Weighted-average common shares outstanding – diluted 18,005 17,968 17,961
Diluted (loss) income per common share $ (0.32) $ (0.71) $ (1.04)
Diluted loss from continuing operations per common share $ (0.32) $ (0.68) $ (1.02)