Credit Losses - Summary of Activity in Allowance for Credit Losses on Trade Receivables (Detail) - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Credit Loss [Abstract]
Beginning Balance	$ 23,795
Provision for credit losses	7,993	$ 7,150
Write-offs	(4,823)
Recoveries of amounts previously written off	206
Foreign currency translation	682
Ending Balance	$ 27,853