Credit Losses (Tables)

12 Months Ended

Apr. 30, 2021

Summary of Activity in Allowance for Credit Losses on Trade Receivables

The activity in the allowance for credit losses on the Company's trade receivables is as follows:

	(in thousands)
Balance at April 30, 2018	$	17,845
Provision for credit losses		14,260
Write-offs		(10,608	)
Recoveries of amounts previously written off		911
Foreign currency translation		(826	)
Balance at April 30, 2019		21,582
Provision for credit losses		14,644
Write-offs		(12,518	)
Recoveries of amounts previously written off		398
Foreign currency translation		(311	)
Balance at April 30, 2020		23,795
Provision for credit losses		15,763
Write-offs		(12,073	)
Recoveries of amounts previously written off		311
Foreign currency translation		1,528
Balance at April 30, 2021	$	29,324

Schedule of Fair Value and Unrealized Losses on Available for Sale Debt Securities

The fair value and unrealized losses on available for sale debt securities, aggregated by investment category and the length of time the security has been in an unrealized loss position, are as follows:

	Less Than 12 Months				Balance Sheet Classification
	Fair Value		Unrealized Loss		Cash and Cash Equivalents		Marketable Securities, Current		Marketable Securities, Non-Current
Balance at April 30, 2021	(in thousands)
Commercial paper	$	36,378	$	7	$	5,749	$	30,629	$	—
Corporate notes/bonds	$	26,350	$	20	$	—	$	10,133	$	16,217