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Provision for Income Taxes - Reconciliation of Effective Tax Rate (Details)	12 Months Ended
	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%)

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to Increase in uncertain tax position.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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