Provision for Income Taxes - Reconciliation of Effective Tax Rate (Details)	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Income Tax Disclosure [Abstract]
Federal income tax at statutory rate	21.00%	21.00%
US vs. foreign tax rate difference	(0.50%)	1.10%
State income tax, net of federal benefit	(0.20%)	0.90%
Permanent differences	(15.00%)	(25.40%)
Increase in uncertain tax position	(1.50%)	(0.00%)
Goodwill impairment	(3.80%)	(0.00%)
Change in valuation allowance	(7.10%)	41.00%
Changes in tax rates	0.00%	6.10%
Income tax expense	(7.10%)	44.70%