Credit Losses (Tables)

6 Months Ended

Oct. 31, 2020

Credit Loss [Abstract]

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, 2020	$	23,795
Provision for credit losses		7,993
Write-offs		(4,823	)
Recoveries of amounts previously written off		206
Foreign currency translation		682
Balance at October 31, 2020	$	27,853

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
Balance at October 31, 2020	Fair Value		Unrealized Loss		Cash and Cash Equivalents		Marketable Securities, Current
	(in thousands)
Commercial paper	$	15,988	$	3	$	—	$	15,988
Corporate notes/bonds	$	10,470	$	6	$	—	$	10,470
U.S. Treasury and Agency Securities	$	1,974	$	1	$	—	$	1,974