Income taxes (Tables)
 12 Months Ended
Mar. 28, 2020
Income Tax Disclosure [Abstract]  
Summary of Net Deferred Tax Assets Related to Continuing Operations
The significant items comprising the Company’s net deferred tax assets at March 28, 2020 and March 30, 2019 are as follows:
 
   
Fiscal Year Ended
 
   
March 28, 2020
   
March 30, 2019
 
Deferred tax assets:  
(In thousands)
 
Loss and tax credit carry forwards
  $14,987   $14,053 
Difference between book and tax basis of property and equipment
   3,674    4,036 
Operating lease
right-of-use
asset
   3,820    — 
Other reserves not currently deductible
   136    151 
Expenses not currently deductible
   —      1,153 
Other
   (142)    (117) 
Net deferred tax asset before valuation allowance
   22,475    19,276 
Valuation allowance
   (22,475)    (19,276) 
  
 
 
   
 
 
 
Net deferred tax asset
  $—     $—   
Components of Income Tax Expense (Benefit) from Continuing Operations
The Company’s income tax expense (benefit) consists of the following components:
 
   
Fiscal Year Ended
 
   
March 28, 2020
   
March 30, 2019
   
March 31, 2018
 
   
(In thousands)
 
Income tax expense (benefit):
      
Current
  $—     $—     $—   
Deferred
   (3,195)    (4,769)    (5,922) 
Valuation allowance
   3,195    4,769    5,922 
Income tax expense
  $—     $—     $—   
Schedule of Effective Income Tax Rate Reconciliation
The Company’s provision for income taxes varies from the amount computed by applying the statutory income tax rates for the reasons summarized below:
 
   
Fiscal Year Ended
 
   
March 28, 2020
  
March 30, 2019
  
March 31, 2018
 
Canadian statutory rate
   26.6%   26.8%   26.6% 
Rate differential for U.S. operations
   0.0%   0.1%   0.4% 
Utilization of unrecognized losses and other tax attributes
   (26.4%)   (26.2%)   (27.1%) 
Permanent differences and other
   (0.2%)   (0.7%)   0.1% 
  
 
 
  
 
 
  
 
 
 
Total
   0%   0%   0%