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Fair Value of Assets Measured on Recurring Basis (Detail) (Fair value, recurring basis, USD $)
In Thousands, unless otherwise specified
Oct. 31, 2013
Apr. 30, 2013
Assets:    
Cash equivalents $ 52,901 [1] $ 100,413 [1]
Total assets 52,901 100,413
(Level 1)
    
Assets:    
Cash equivalents 52,901 [1] 100,413 [1]
Total assets $ 52,901 $ 100,413
[1] Cash and cash equivalents include operating cash and money market accounts.