Investment Securities (Tables)

9 Months Ended

Feb. 29, 2020

Investments, Debt and Equity Securities [Abstract]

Schedule Of Investment Securities

The following represents the Company’s investment securities as of February 29, 2020 and June 1, 2019 (in thousands):

February 29, 2020	Amortized Cost		Unrealized Gains		Unrealized Losses		Estimated Fair Value
Municipal bonds	$	18,862	$	134	$	—	$	18,996
Corporate bonds	59,329		329		—		59,658
Certificates of deposits	1,003		—		2		1,001
Asset backed securities	1,196		12		—		1,208
Total current investment securities	$	80,390	$	475	$	2	$	80,863
Mutual funds	$	1,994	$	661	$	—	$	2,655
Total noncurrent investment securities	$	1,994	$	661	$	—	$	2,655

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
Commercial paper	9,953		—		8		9,945
Corporate bonds	147,068		94		—		147,162
Certificates of deposits	6,149		—		1		6,148
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 February 29, 2020, are as follows (in thousands):

	Estimated Fair Value
Within one year	$	67,854
1-5 years	13,009
Total	$	80,863