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Intangibles - Intangibles included in other assets on the balance sheet (Details) - USD ($)	3 Months Ended	12 Months Ended
	Oct. 31, 2017	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Intangibles
Intangibles, net		$ 13,637,000	$ 459,000
Amortization expense		$ 2,822,000	$ 357,000	$ 296,000
Altoy
Intangibles
Impairment loss	$ 899,000
Weighted average
Intangibles
Weighted average amortization period		4 years	1 year
Technology
Intangibles
Weighted average amortization period		6 years
Licenses
Intangibles
Weighted average amortization period		3 years
In process research and development
Intangibles
Weighted average amortization period		3 years
Other assets, long term
Intangibles
Intangibles, gross		$ 17,770,000	$ 1,770,000
Less accumulated amortization		(4,133,000)	(1,311,000)
Intangibles, net		13,637,000	459,000
Other assets, long term \| Technology
Intangibles
Intangibles, gross		14,950,000
Other assets, long term \| Licenses
Intangibles
Intangibles, gross		1,006,000	1,006,000
Other assets, long term \| Customer relationships
Intangibles
Intangibles, gross		873,000	733,000
Other assets, long term \| In process research and development
Intangibles
Intangibles, gross		550,000
Other assets, long term \| Non-compete agreements
Intangibles
Intangibles, gross		320,000
Other assets, long term \| Trademarks and tradenames
Intangibles
Intangibles, gross		68,000	28,000
Other assets, long term \| Other
Intangibles
Intangibles, gross		$ 3,000	$ 3,000