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Basis of Presentation - Additional Information (Detail)
$ in Millions
 12 Months Ended
Aug. 11, 2017
Mar. 31, 2018
USD ($)
Mar. 25, 2017
USD ($)
Mar. 26, 2016
USD ($)
Mar. 31, 2018
CAD ($)
Oct. 23, 2017
USD ($)
Organization And Description Of Business [Line Items]            
Property and equipment   $ 15,067,000 $ 11,606,000 [1]      
Intangibles   3,007,000 2,707,000 [1]      
Line of credit facility covenant terms cash minimum   6,600,000     $ 8.5  
Net (loss) income from continuing operations   (16,778,000) (7,056,000) [1] $ 225,000 [1]    
Net cash (used in) provided by operating activities from continuing operations   (15,030,000) (3,349,000) [1] 1,394,000 [1]    
New Credit Facility [Member]            
Organization And Description Of Business [Line Items]            
Line of credit facility covenant terms cash minimum   6,600,000     8.5  
Line of credit facility minimum excess availability   $ 6,600,000     $ 8.5  
Line of credit facility, covenant terms   The New Credit Facility is to maintain minimum excess availability of not less than CAD$8.5 million (US$6.6 million) at all times, except that the Company shall not be in breach of this covenant if excess availability falls below CAD$8.5 million (US$6.6 million) for not more than two consecutive business days once during any fiscal month.        
Discretionary reserves   $ 0 $ 0 $ 0    
Mayors Disposal Group [Member]            
Organization And Description Of Business [Line Items]            
Disposal group equity interests sold 100.00%          
Sale total consideration           $ 106,756,000
Restatement Adjustment [Member]            
Organization And Description Of Business [Line Items]            
Property and equipment   (2,300,000)        
Intangibles   $ 2,300,000        
[1] Retrospectively revised (see note 18)