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Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 12 Months Ended
Mar. 31, 2018
USD ($)
shares
Mar. 25, 2017
USD ($)
shares
Mar. 26, 2016
USD ($)
shares
Dec. 11, 2016
USD ($)
Dec. 11, 2016
CAD ($)
Nov. 01, 2016
USD ($)
Nov. 01, 2016
CAD ($)
Significant Accounting Policies [Line Items]              
Amounts receivable from credit card issuers $ 800,000 $ 1,900,000          
Accounts receivable periods 30 days            
Amortization method of intangible assets Trademarks and tradenames are amortized using the straight-line method over a period of 15 to 20 years.            
Intangible assets $ 3,600,000 3,100,000          
Accumulated amortization of intangible assets $ 600,000 400,000          
Period of warranties 5 years            
Asset impairment charges $ 2,200,000 0 $ 0        
Reimbursement of advertising cost 800,000 900,000 900,000        
Advertising and marketing expense 7,500,000 5,600,000 $ 5,700,000        
Deferred operating lease liabilities $ 4,900,000 $ 3,200,000          
Head Office [Member]              
Significant Accounting Policies [Line Items]              
Capital lease asset           $ 6,500,000 $ 8.7
Capital lease obligation           8,700,000 11.6
Lease period 20 years            
Annual rent rate       $ 1,600,000 $ 2.2    
Head Office [Member] | Other Noncurrent Liabilities [Member]              
Significant Accounting Policies [Line Items]              
Non-cash gain           $ 2,200,000 $ 2.9
Equity Option [Member]              
Significant Accounting Policies [Line Items]              
Outstanding | shares 382,693 417,377 666,789        
Warrant [Member]              
Significant Accounting Policies [Line Items]              
Outstanding | shares 381,487 382,693 382,693        
Cost of Goods Sold [Member]              
Significant Accounting Policies [Line Items]              
Foreign exchange gains (losses) $ 0.2 $ (0.2) $ (0.3)        
Interest and Other Financial Costs [Member]              
Significant Accounting Policies [Line Items]              
Foreign exchange gains (losses) $ 0.1 $ 0.1 $ (0.2)        
Maximum [Member]              
Significant Accounting Policies [Line Items]              
Product return, Days 90 days            
Consumer credit receivable charges 10.99%            
Minimum [Member]              
Significant Accounting Policies [Line Items]              
Product return, Days 10 days            
Consumer credit receivable charges 0.00%