Marketable Securities (Tables)

9 Months Ended

Feb. 29, 2016

Investments Debt And Equity Securities [Abstract]

Summary of Marketable Securities by Asset Type

The following tables summarize marketable securities held at February 29, 2016 and May 31, 2015 by asset type:

	Available-For-Sale Securities
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value (Net Carrying Amount)
February 29, 2016
Equity securities:
Stocks - foreign	$	4,297	$	257	$	(496	)	$	4,058
Stocks - domestic		27,596		2,899		(1,952	)		28,543
Mutual funds - foreign		35,855		620		(7,072	)		29,403
Mutual funds - domestic		58,174		10		(7,310	)		50,874
Total equity securities		125,922		3,786		(16,830	)		112,878
Fixed maturity:
U.S. treasury and other government		21,777		232		(210	)		21,799
Corporate bonds		944		123		-			1,067
Mortgage-backed securities		18		22		-			40
Total fixed maturity securities		22,739		377		(210	)		22,906
Total	$	148,661	$	4,163	$	(17,040	)	$	135,784

	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 February 29, 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:

	February 29, 2016					May 31, 2015
(In thousands)	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Total investments with unrealized losses	$	98,332	$	(17,040	)	$	58,978	$	(3,815	)
Unrealized losses with a loss position for less    than 12 months		50,214		(9,564	)		32,693		(1,441	)
Unrealized losses with a loss position for more    than 12 months		48,118		(7,476	)		26,285		(2,374	)

Net Carrying Values of Debt Securities by Contractual Maturity

The net carrying values of debt securities at February 29, 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	$	5,000	$	4,925
One year through five years		14,163		14,149
Six years through ten years		2,487		2,579
After ten years		1,089		1,253
	$	22,739	$	22,906