XML 60 R61.htm IDEA: XBRL DOCUMENT v3.2.0.727
Income taxes - Additional Information (Detail)
 12 Months Ended
Mar. 28, 2015
USD ($)
Mar. 28, 2015
CAD
Mar. 29, 2014
USD ($)
Mar. 30, 2013
USD ($)
Tax Credit Carryforward [Line Items]        
Accrued interest or penalties related to uncertain tax positions $ 0      
Non cash valuation allowance 58,798,000   $ 56,809,000  
Federal tax payable 0   $ 18,000 $ 5,800
Alternative Minimum Tax Credit [Member]        
Tax Credit Carryforward [Line Items]        
Investment tax credits 1,000,000      
Foreign Tax Authority [Member]        
Tax Credit Carryforward [Line Items]        
Federal non capital losses $ 106,500,000      
Federal net operating loss carry forwards expiration Dates Beginning in fiscal 2020 through fiscal 2034      
Domestic Tax Authority [Member]        
Tax Credit Carryforward [Line Items]        
Federal non capital losses $ 20,700,000 CAD 26,100,000    
Domestic Tax Authority [Member] | Investment Tax Credit Carryforward [Member]        
Tax Credit Carryforward [Line Items]        
Investment tax credits $ 207,000 CAD 260,000    
Expire date Between 2022 and 2035      
Foreign Country Section Three Eight Two Limitation [Member]        
Tax Credit Carryforward [Line Items]        
Pre-acquisition net operating loss $ 35,300,000      
Pre-acquisition net operating loss limited 953,000      
State and Local Jurisdiction [Member]        
Tax Credit Carryforward [Line Items]        
Federal non capital losses $ 99,100,000      
Federal net operating loss carry forwards expiration Dates Beginning in fiscal 2018 through fiscal 2034