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Provision for Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2013
Tax Credit Carryforward [Line Items]
One-time reduction of deferred tax assets	$ 7,600
Deferred tax assets, valuation allowance	14,953	$ 14,409
Liabilities, other than long-term debt, noncurrent	151
Operating loss, limitations on use	432		$ 12,000
Domestic Tax Authority
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	43,000	41,000
Foreign Tax Authority
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	$ 0	$ 890

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Operating Loss Carryforwards, Limitations On Use, Amount

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Aggregated carrying amounts of obligations as of the balance sheet date, excluding long-term debt, incurred as part of the normal operations that are expected to be paid after one year or beyond the normal operating cycle, if longer. Alternate captions include Total Deferred Credits and Other Liabilities.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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