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Provision for Income Taxes - Reconciliation of Effective Tax Rate (Details) | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018
Income Tax Disclosure [Abstract] |  |
Federal income tax at statutory rate | 21.00% | 29.70%
US vs. foreign tax rate difference | 1.10% | 0.10%
State income tax, net of federal benefit | 0.90% | (0.20%)
Permanent differences | (25.40%) | 0.50%
Increase in uncertain tax position | 0.00% | (2.10%)
Other | 0.00% | 0.00%
Change in valuation allowance | 41.00% | 498.00%
Changes in tax rates | 6.10% | (528.40%)
Income tax expense | 44.70% | (2.40%)

X
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