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Provision for Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Apr. 30, 2018 | Apr. 30, 2017
Tax Credit Carryforward [Line Items] |  |
One-time reduction of deferred tax assets | $ 7,600 |
Deferred tax assets, valuation allowance | 14,409 | $ 21,779
Liabilities, other than long-term debt, noncurrent | 151 |
Domestic Tax Authority |  |
Tax Credit Carryforward [Line Items] |  |
Operating loss carryforwards | $ 41,000 | $ 41,000
Operating loss carryforwards, expiration year | 2025 |
Foreign Tax Authority |  |
Tax Credit Carryforward [Line Items] |  |
Operating loss carryforwards | $ 890 |

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- Definition 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. + References No definition available. + Details
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