Capital stock (Tables)
 12 Months Ended
Mar. 28, 2020
Equity [Abstract]  
Summary of Common Stock Outstanding
The issued and outstanding shares are as follows:
   
Class A common stock
   
Class B common stock
   
Total common stock
 
   
Number of
Shares
   
Amount
   
Number of
Shares
   
Amount
   
Number of
Shares
   
Amount
 
Balance as of March 31, 2018
   10,242,911   $35,593    7,717,970   $57,755    17,960,881   $93,348 
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Exercise of stock options
   —      —      —      —      —      —   
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Balance as of March 30, 2019
   10,242,911   $35,593    7,717,970   $57,755    17,960,881   $93,348 
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Exercise of stock options
   10,000    20    —      —      10,000    20 
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Balance as of March 28, 2020
   10,252,911   $35,613    7,717,970   $57,755    17,970,881   $93,368