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Long-term Debt and Other Credit Arrangements - Summary of Amounts Outstanding Under Term Loan (Detail) - USD ($)
$ in Thousands
Apr. 30, 2016
Apr. 30, 2015
Debt Instrument [Line Items]    
Less: current portion $ (421) $ (421)
Long-term debt 3,349 3,771
Term Loan A [Member]    
Debt Instrument [Line Items]    
Term Loan payable 2,866 3,066
Term Loan B [Member]    
Debt Instrument [Line Items]    
Term Loan payable $ 904 $ 1,126