Marketable Securities (Tables)

6 Months Ended

Nov. 30, 2016

Investments Debt And Equity Securities [Abstract]

Summary of Marketable Securities by Asset Type

The following tables summarize marketable securities held at November 30, 2016 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)
November 30, 2016
Equity securities:
Stocks – foreign	$	5,699	$	229	$	(323	)	$	5,605
Stocks – domestic		31,050		2,086		(1,325	)		31,811
Mutual funds – foreign		34,419		920		(3,204	)		32,135
Mutual funds – domestic		62,572		1,393		(2,938	)		61,027
Total equity securities		133,740		4,628		(7,790	)		130,578
Fixed maturity:
U.S. treasury and other government		22,235		76		(295	)		22,016
Corporate bonds		774		104		(8	)		870
Total fixed maturity securities		23,009		180		(303	)		22,886
Total	$	156,749	$	4,808	$	(8,093	)	$	153,464

	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 Income (Loss), Aggregated by Length of Time Investments

Summarized below are the securities we held at November 30, 2016 and May 31, 2016 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:

	November 30, 2016					May 31, 2016
(In thousands)	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Total investments with unrealized losses	$	99,283	$	(8,093	)	$	89,360	$	(10,182	)
Unrealized losses with a loss position for less than 12 months		35,039		(1,925	)		41,762		(4,856	)
Unrealized losses with a loss position for more than 12 months		64,244		(6,168	)		47,598		(5,326	)

Net Carrying Values of Debt Securities by Contractual Maturity

The net carrying values of debt securities at November 30, 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)	AmortizedCost		FairValue
Due:
Less than one year	$	6,157	$	6,127
One year through five years		12,606		12,486
Six years through ten years		3,140		3,079
After ten years		1,106		1,194
	$	23,009	$	22,886