Accounts Receivable - Change In Allowance (Details) $ in Thousands	9 Months Ended
	Jan. 31, 2021 USD ($)
Change in allowance
Beginning balance	$ 2,861
Ending balance	3,308
Accounts receivable.
Change in allowance
Beginning balance	2,861
Provision	1,136
Write-offs	(689)
Ending balance	$ 3,308