Investment Securities (Tables)

3 Months Ended

Aug. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Schedule Of Investment Securities

The following represents the Company’s investment securities as of August 31, 2019 and June 1, 2019 (in thousands):

August 31, 2019	Amortized Cost		Unrealized Gains		Unrealized Losses		Estimated Fair Value
US government and agency obligations	$	30,943	$	173	$	—	$	31,116
Municipal bonds	34,632		200		—		34,832
Commercial paper	2,990		1		—		2,991
Corporate bonds	116,061		359		—		116,420
Certificates of deposits	1,004		—		—		1,004
Asset backed securities	3,323		14		—		3,337
Total current investment securities	$	188,953	$	747	$	—	$	189,700
Mutual funds	$	1,899	$	713	$	—	$	2,612
Total noncurrent investment securities	$	1,899	$	713	$	—	$	2,612

June 1, 2019	Amortized Cost		Unrealized Gains		Unrealized Losses		Estimated Fair Value
US government and agency obligations	$	30,896	$	78	$	—	$	30,974
Municipal bonds	50,220		133		—		50,353
Certificates of deposits	6,149		—		1		6,148
Commercial paper	9,953		—		8		9,945
Corporate bonds	147,068		94		—		147,162
Asset backed securities	5,589		10		—		5,599
Total current investment securities	$	249,875	$	315	$	9	$	250,181
Mutual funds	$	2,331	$	1,026	$	—	$	3,357
Total noncurrent investment securities	$	2,331	$	1,026	$	—	$	3,357

Schedule Of Contractual Maturities Of Investment Securities

Contractual maturities of current investments at August 31, 2019, are as follows (in thousands):

	Estimated Fair Value
Within one year	$	127,143
1-5 years	62,557
Total	$	189,700