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Long-term debt - Additional Information (Detail)
 12 Months Ended
Mar. 30, 2013
USD ($)
D
Mar. 30, 2013
CAD
D
Dec. 11, 2012
USD ($)
Dec. 11, 2012
CAD
Mar. 31, 2012
USD ($)
Debt Disclosure [Abstract]          
Outstanding letters of credit $ 1,700,000       $ 1,800,000
Lease period 20 20      
Annual rent rate $ 2,000,000 2,013,138 $ 1,800,000 1,830,125  
Increase in percentage of annual rent rate 10.00% 10.00%      
Condition for lease agreement The Company has four options to renew and extend the term of the lease for four further terms of five years each, except for the last option which is five years less eleven days, terminating on November 30, 2040. Subject to specific terms and conditions, the Company also has two options to purchase the premises, which may be exercised no later than six months prior to the end of the fifteenth year of the term of the lease and the end of the twentieth year of the term of the lease, respectively. The Company has four options to renew and extend the term of the lease for four further terms of five years each, except for the last option which is five years less eleven days, terminating on November 30, 2040. Subject to specific terms and conditions, the Company also has two options to purchase the premises, which may be exercised no later than six months prior to the end of the fifteenth year of the term of the lease and the end of the twentieth year of the term of the lease, respectively.