Credit Losses - Summary of Activity in Allowance for Credit Losses on Trade Receivables (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Credit Loss [Abstract]
Beginning Balance	$ 23,795	$ 21,582	$ 17,845
Provision for credit losses	15,763	14,644	14,260
Write-offs	(12,073)	(12,518)	(10,608)
Recoveries of amounts previously written off	311	398	911
Foreign currency translation	1,528	(311)	(826)
Ending Balance	$ 29,324	$ 23,795	$ 21,582