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Capital Stock - Summary of Common Stock Outstanding (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Class of Stock [Line Items]    
Beginning Balance, Shares 17,960,881 17,960,881
Exercise of stock options, Shares 10,000 0
Ending Balance, Shares 17,970,881 17,960,881
Balance as of beginning balance $ 93,348 $ 93,348
Exercise of stock options 10 0
Balance as of ending balance $ 93,368 $ 93,348
Class A Common Stock [Member]    
Class of Stock [Line Items]    
Beginning Balance, Shares 10,242,911 10,242,911
Exercise of stock options, Shares 10,000 0
Ending Balance, Shares 10,252,911 10,242,911
Balance as of beginning balance $ 35,593 $ 35,593
Exercise of stock options 20 0
Balance as of ending balance $ 35,613 $ 35,593
Class B Common Stock [Member]    
Class of Stock [Line Items]    
Beginning Balance, Shares 7,717,970 7,717,970
Exercise of stock options, Shares 0 0
Ending Balance, Shares 7,717,970 7,717,970
Balance as of beginning balance $ 57,755 $ 57,755
Exercise of stock options 0 0
Balance as of ending balance $ 57,755 $ 57,755