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Capital Stock - Summary of Common Stock Outstanding (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 25, 2017
Class of Stock [Line Items]    
Beginning Balance, Shares 17,960,881 17,960,881
Exercise of stock options, Shares 0 0
Ending Balance, Shares 17,960,881 17,960,881
Balance as of beginning balance $ 69,601 $ 69,601
Exercise of stock options 0 0
Balance as of ending balance $ 69,601 $ 69,601
Class A Common Stock [Member]    
Class of Stock [Line Items]    
Beginning Balance, Shares 10,242,911 [1] 10,242,911
Exercise of stock options, Shares 0 0
Ending Balance, Shares 10,242,911 10,242,911 [1]
Balance as of beginning balance $ 30,988 [1],[2] $ 30,988
Exercise of stock options 0 0
Balance as of ending balance [2] $ 30,988 $ 30,988 [1]
Class B Common Stock [Member]    
Class of Stock [Line Items]    
Beginning Balance, Shares 7,717,970 [1] 7,717,970
Exercise of stock options, Shares 0 0
Ending Balance, Shares 7,717,970 7,717,970 [1]
Balance as of beginning balance $ 38,613 [1],[2] $ 38,613
Exercise of stock options 0 0
Balance as of ending balance [2] $ 38,613 $ 38,613 [1]
[1] Retrospectively revised (see note 18)
[2] unlimited shares authorized