Marketable Securities (Tables)

12 Months Ended

May 31, 2016

Investments Debt And Equity Securities [Abstract]

Summary of Marketable Securities by Asset Type

The following tables summarize marketable securities held at May 31, 2016 and 2015 by asset type:

	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

	Available-For-Sale Securities
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value (Net Carrying Amount)
May 31, 2015
Equity securities:
Stocks - foreign	$	3,722	$	339	$	(85	)	$	3,976
Stocks - domestic		34,368		5,649		(559	)		39,458
Mutual funds - foreign		32,657		2,114		(230	)		34,541
Mutual funds - domestic		56,442		228		(2,779	)		53,891
Total equity securities		127,189		8,330		(3,653	)		131,866
Fixed maturity:
U.S. treasury and other government		21,340		171		(162	)		21,349
Corporate bonds		1,218		171		-			1,389
Foreign bonds		36		2		-			38
Mortgage-backed securities		81		47		-			128
Total fixed maturity securities		22,675		391		(162	)		22,904
Total	$	149,864	$	8,721	$	(3,815	)	$	154,770

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

Summarized below are the securities we held at May 31, 2016 and May 31, 2015 that were in an unrealized loss position and that were included in accumulated other comprehensive income (loss), aggregated by the length of time the investments had been in that position:

	May 31, 2016					May 31, 2015
(In thousands)	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Total investments with unrealized losses	$	89,360	$	(10,182	)	$	58,978	$	(3,815	)
Unrealized losses with a loss position for less than 12 months		41,762		(4,856	)		32,693		(1,441	)
Unrealized losses with a loss position for more than 12 months		47,598		(5,326	)		26,285		(2,374	)

Net Carrying Values of Debt Securities by Contractual Maturity

The net carrying values of debt securities at May 31, 2016, 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)	Amortized Cost		Fair Value
Due:
Less than one year	$	5,155	$	5,160
One year through five years		13,040		13,079
Six years through ten years		3,224		3,293
After ten years		1,172		1,330
	$	22,591	$	22,862