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Contractual Maturities of Debt Securities Classified as Held to Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2014
Apr. 30, 2013
Schedule of Held-to-maturity Securities [Line Items]    
Due within one year   $ 226
Due within two years      
Due within three years      
Due after three years      
Total Due   $ 226