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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Income Tax Disclosure [Abstract] |  |  |
Income taxes at the statutory rates | 30.40% | 35.00% | 35.00%
Change in tax rate provisional income tax expense (benefit) | $ 173,000 |  |
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowance | 47 | $ 60 |
Valuation allowance, increase (decrease) | (13) | (24) |
Unrecognized tax benefits | 6,421 | 5,362 | $ 6,484
Unrecognized tax benefits that would impact effective tax rate | 5,095 |  |
Increase (decrease) in unrecognized tax benefits | 1,059 |  |
Accrued interest and penalties | 191 | 141 |
Increase in tax expense | 50 | $ (76) |
Decrease in unrecognized tax benefits is reasonable possible | 1,300 |  |
Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 13,188 |  |
State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 82,243 |  |
Tax credit carryforward | $ 380 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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