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Long-term Debt and Other Credit Arrangements - Summary of Amounts Outstanding Under Term Loan (Detail) - USD ($) $ in Thousands	Apr. 30, 2019	Apr. 30, 2018
Debt Instrument [Line Items]
Less: current portion	$ (1,167)	$ (1,167)
Long-term debt	97	1,264
Term Loan A payable
Debt Instrument [Line Items]
Term Loan payable	1,024	1,970
Term Loan B payable
Debt Instrument [Line Items]
Term Loan payable	$ 240	$ 461

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Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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