Cash and Marketable Securities (Tables)

9 Months Ended

Feb. 28, 2021

Marketable Securities as of February 28, 2021 and May 31, 2020 are listed below by classification and remaining maturities.


(in thousands)	Maturity	February 28, 2021		May 31, 2020
US Treasuries	0 - 90 days	$	—	$	—
	91 - 180 days		—		—
	181 days - 1 year		—		2,532
	1 - 2 years		—		—
Commercial Paper & Corporate Bonds	0 - 90 days		158,183		133,130
	91 - 180 days		81,850		73,824
	181 days - 1 year		30,189		43,231
	1 - 2 years		1,310		7,839
Certificates of Deposit	0 - 90 days		1,253		1,003
	91 - 180 days		3,550		5,184
	181 days -1 year		3,277		6,069
	1 - 2 years		253		4,592

Total Marketable Securities		$	279,865	$	277,404

The components of marketable securities at February 28, 2021 are as follows:


(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
US Treasuries	$	—	$	—	$	—		$	—
Commercial Paper & Corporate Bonds		271,600		185		(253	)		271,532
Certificates of Deposit		8,284		49		—			8,333

Total Marketable Securities	$	279,884	$	234	$	(253	)	$	279,865

The components of marketable securities at May 31, 2020 are as follows:


(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
US Treasuries	$	2,502	$	30	$	—		$	2,532
Commercial Paper & Corporate Bonds		257,700		347		(23	)		258,024
Certificates of Deposit		16,648		200		—			16,848

Total Marketable Securities	$	276,850	$	577	$	(23	)	$	277,404