Cash and Marketable Securities (Tables)

6 Months Ended

Nov. 30, 2020

Marketable Securities as of November 30, 2020 and May 31, 2020 are listed below by classification and remaining maturities.


			November 30,		May 31,
(in thousands)	Maturity		2020		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		114,237		133,130
		91 - 180 days		132,758		73,824
		181 days - 1 year		15,978		43,231
		1 - 2 years		1,830		7,839
Certificates of Deposit		0 - 90 days		4,012		1,003
		91 - 180 days		2,260		5,184
		181 days - 1 year		4,553		6,069
		1 - 2 years		1,270		4,592

Total Marketable Securities			$	276,898	$	277,404

The components of marketable securities at November 30, 2020 are as follows:


	Amortized		Unrealized		Unrealized
(in thousands)	Cost		Gains		Losses			Fair Value
US Treasuries	$	—	$	—	$	—		$	—
Commercial Paper & Corporate Bonds		264,616		338		(151	)		264,803
Certificates of Deposit		12,009		86		—			12,095

Total Marketable Securities	$	276,625	$	424	$	(151	)	$	276,898

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


	Amortized		Unrealized		Unrealized
(in thousands)	Cost		Gains		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