Marketable Securities (Tables)

12 Months Ended

Apr. 30, 2022

Investments, Debt and Equity Securities [Abstract]

Summary of Fair Value of Company's Investments By Type

The following tables summarize the fair value of the Company’s investments by type as of April 30, 2022 and 2021:

	April 30, 2022
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
Corporate debt securities	$	112,997	$	2	$	(994	)	$	112,005
Obligations of the U.S. Government and its agencies		23,602		—		(137	)		23,465
Total investments	$	136,599	$	2	$	(1,131	)	$	135,470

	April 30, 2021
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
Corporate debt securities	$	158,063	$	55	$	(245	)	$	157,873
Obligations of the U.S. Government and its agencies		40,473		7		(16	)		40,464
Total investments	$	198,536	$	62	$	(261	)	$	198,337

Summary of Company's Investments with Unrealized Losses, Aggregated by Investment Type

The following table summarizes the Company’s investments with unrealized losses, aggregated by investment type and the length of time that individual investments have been in a continuous unrealized loss position:

	April 30, 2022
	Less than 12 Months					Greater than 12 Months					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	98,997	$	(895	)	$	13,008	$	(99	)	$	112,005	$	(994	)
Obligations of the U.S. Government and its agencies		23,465		(137	)		—		—			23,465		(137	)
Total investments	$	122,462	$	(1,032	)	$	13,008	$	(99	)	$	135,470	$	(1,131	)

Summary of Scheduled Maturity for Marketable Securities

The following table summarizes the scheduled maturity for the Company’s investments at April 30, 2022:

	April 30,
	2022
Maturing in one year or less	$	101,664
Maturing after one year through two years		22,562
Maturing after two years through six years		11,244
Total investments	$	135,470