Marketable Securities (Tables)

3 Months Ended

Aug. 31, 2017

Investments Debt And Equity Securities [Abstract]

Summary of Marketable Securities by Asset Type

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

	Available-For-Sale Securities
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value (Net Carrying Amount)
August 31, 2017
Equity securities:
Stocks - domestic	$	2,110	$	76	$	-		$	2,186
Mutual funds - foreign		27,754		2,463		(218	)		29,999
Mutual funds - domestic		92,075		1,749		(2,987	)		90,837
Total equity securities		121,939		4,288		(3,205	)		123,022
Fixed maturity:
U.S. treasury and other government		22,170		140		(170	)		22,140
Corporate bonds		660		97		(6	)		751
Total fixed maturity securities		22,830		237		(176	)		22,891
Total	$	144,769	$	4,525	$	(3,381	)	$	145,913

	Available-For-Sale Securities
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value (Net Carrying Amount)
May 31, 2017
Equity securities:
Stocks - domestic	$	2,391	$	76	$	-		$	2,467
Mutual funds - foreign		35,169		2,470		(204	)		37,435
Mutual funds - domestic		102,671		2,084		(3,118	)		101,637
Total equity securities		140,231		4,630		(3,322	)		141,539
Fixed maturity:
U.S. treasury and other government		22,176		120		(177	)		22,119
Corporate bonds		706		97		(6	)		797
Total fixed maturity securities		22,882		217		(183	)		22,916
Total	$	163,113	$	4,847	$	(3,505	)	$	164,455

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 August 31, 2017 and May 31, 2017 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:

	August 31, 2017					May 31, 2017
(In thousands)	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Total investments with unrealized losses	$	44,094	$	(3,381	)	$	59,987	$	(3,505	)
Unrealized losses with a loss position for less than 12 months		9,808		(208	)		40,854		(2,983	)
Unrealized losses with a loss position for more than 12 months		34,286		(3,173	)		19,133		(522	)

Net Carrying Values of Debt Securities by Contractual Maturity

The net carrying values of debt securities at August 31, 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	$	3,304	$	3,305
One year through five years		15,154		15,071
Six years through ten years		3,170		3,196
After ten years		1,202		1,319
	$	22,830	$	22,891