Credit Losses - Summary of Activity in Allowance for Credit Losses on Trade Receivables (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Credit Loss [Abstract]
Beginning Balance	$ 23,795
Provision for credit losses	4,626	$ 3,549
Write-offs	(2,697)
Recoveries of amounts previously written off	43
Foreign currency translation	802
Ending Balance	$ 26,569