Accounts Receivable - Trade Accounts And Notes Receivable (Details) - USD ($) $ in Thousands	Jul. 31, 2020	Apr. 30, 2020
Accounts Receivable
Trade receivables	$ 422,477	$ 398,739
Other receivables	13,743	11,656
Allowance for expected credit losses	(2,878)	(2,861)
Other allowances	(2,411)	(2,280)
Trade accounts and notes receivable	$ 430,931	$ 405,254