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Long-term Debt and Other Credit Arrangements - Summary of Amounts Outstanding Under Term Loan (Detail) - USD ($)
$ in Thousands
Apr. 30, 2017
Apr. 30, 2016
Debt Instrument [Line Items]    
Less: current portion $ (918) $ (421)
Long-term debt 2,431 3,349
Term Loan A [Member]    
Debt Instrument [Line Items]    
Term Loan payable 2,667 2,866
Term Loan B [Member]    
Debt Instrument [Line Items]    
Term Loan payable $ 682 $ 904