Marketable Securities (Tables)

9 Months Ended

Feb. 28, 2017

Investments Debt And Equity Securities [Abstract]

Summary of Marketable Securities by Asset Type

The following tables summarize marketable securities held at February 28, 2017 and May 31, 2016 by asset type:

	Available-For-Sale Securities
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value (Net Carrying Amount)
February 28, 2017
Equity securities:
Stocks - foreign	$	5,700	$	231	$	(155	)	$	5,776
Stocks - domestic		30,690		3,054		(975	)		32,769
Mutual funds - foreign		35,144		1,001		(1,765	)		34,380
Mutual funds - domestic		64,033		1,557		(2,416	)		63,174
Total equity securities		135,567		5,843		(5,311	)		136,099
Fixed maturity:
U.S. treasury and other government		22,499		76		(283	)		22,292
Corporate bonds		715		97		(8	)		804
Total fixed maturity securities		23,214		173		(291	)		23,096
Total	$	158,781	$	6,016	$	(5,602	)	$	159,195

	Available-For-Sale Securities
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value (Net Carrying Amount)
May 31, 2016
Equity securities:
Stocks - foreign	$	5,051	$	439	$	(247	)	$	5,243
Stocks - domestic		27,717		3,831		(911	)		30,637
Mutual funds - foreign		35,903		802		(4,357	)		32,348
Mutual funds - domestic		60,354		99		(4,587	)		55,866
Total equity securities		129,025		5,171		(10,102	)		124,094
Fixed maturity:
U.S. treasury and other government		21,704		214		(80	)		21,838
Corporate bonds		887		137		-			1,024
Total fixed maturity securities		22,591		351		(80	)		22,862
Total	$	151,616	$	5,522	$	(10,182	)	$	146,956

Summary of Securities in Unrealized Loss Position and Included in Accumulated Other Comprehensive (Loss), Aggregated by Length of Time Investments

Summarized below are the securities we held at February 28, 2017 and May 31, 2016 that were in an unrealized loss position and that were included in accumulated other comprehensive (loss), aggregated by the length of time the investments had been in that position:

	February 28, 2017					May 31, 2016
(In thousands)	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Total investments with unrealized losses	$	94,585	$	(5,602	)	$	89,360	$	(10,182	)
Unrealized losses with a loss position for less than 12 months		32,564		(1,250	)		41,762		(4,856	)
Unrealized losses with a loss position for more than 12 months		62,021		(4,352	)		47,598		(5,326	)

Net Carrying Values of Debt Securities by Contractual Maturity

The net carrying values of debt securities at February 28, 2017, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.

(In thousands)	AmortizedCost		FairValue
Due:
Less than one year	$	5,645	$	5,622
One year through five years		13,567		13,433
Six years through ten years		2,958		2,912
After ten years		1,044		1,129
	$	23,214	$	23,096