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Securities - Additional Information (Detail)
In Thousands, unless otherwise specified
Oct. 25, 2014
USD ($)
Oct. 25, 2014
CAD
Oct. 24, 2014
CAD
Apr. 26, 2014
USD ($)
Oct. 25, 2013
CAD
Investments, Debt and Equity Securities [Abstract]          
Total principal amount   65,000 45,000   110,000
Short-term investments 57,850     40,775  
Maturity value of time deposits     45,436