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Provision for Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Apr. 30, 2017 | Apr. 30, 2016
Tax Credit Carryforward [Line Items] |  |
Deferred tax assets, valuation allowance | $ 21,779 | $ 19,071
Liabilities, other than long-term debt, noncurrent | 121 |
Domestic Tax Authority |  |
Tax Credit Carryforward [Line Items] |  |
Operating loss carryforwards | $ 41,000 | $ 36,000
Operating loss carryforwards, expiration year | 2025 |
Foreign Tax Authority |  |
Tax Credit Carryforward [Line Items] |  |
Operating loss carryforwards | $ 900 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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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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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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