Available-For-Sale Securities (Tables)

9 Months Ended

Feb. 28, 2015

Available-For-Sale Securities [Abstract]

Schedule Of Available-For-Sale Securities Classified As Current Assets

	February 28, 2015
(Amounts in thousands)	Amortized Cost		Gains in Accumulated Other Comprehensive Income		Losses in Accumulated Other Comprehensive Income		Estimated Fair Value
State municipal bonds	$	78,433	$	169	$	-	$	78,602
US government obligations		4,454		5		-		4,459
Corporate bonds		119,970		-		84		119,886
Commercial paper		6,992		-		-		6,992
Foreign government obligations		1,048		-		-		1,048
Government agency bonds		4,633		4		-		4,637
Asset Backed Securities		9,182		-		2		9,180
Total available-for-sale securities	$	224,712	$	178	$	86	$	224,804
Mutual Funds*		1,190		546		-		1,736
Total noncurrent available-for-sale securities	$	1,190	$	546	$	-	$	1,736

*The mutual funds are classified as long term and are a part of “other investments” in the Condensed Consolidated Balance Sheet.

	May 31, 2014
(Amounts in thousands)	Amortized Cost		Gains in Accumulated Other Comprehensive Income		Losses in Accumulated Other Comprehensive Income		Estimated Fair Value
State municipal bonds	$	75,659	$	188	$	-	$	75,847
US government obligations		4,056		5		-		4,061
Corporate bonds		102,587		98		-		102,685
Commercial paper		3,927		3		-		3,930
Certificates of deposit		350		1		-		351
Foreign government obligations		1,064		2		-		1,066
Government agency bonds		4,791		7		-		4,798
Variable rate demand notes		2,000		-		-		2,000
Total current available-for-sale securities	$	194,434	$	304	$	-	$	194,738
Mutual Funds*		999		452		-		1,451
Total noncurrent available-for-sale securities	$	999	$	452	$	-	$	1,451

*The mutual funds are classified as long term and are a part of “other investments” in the Condensed Consolidated Balance Sheet.

Schedule Of Contractual Maturities Of Available-For-Sale Debt Securities

		Estimated Fair Value
Within one year	$	115,120
After 1-5 years		109,684
After 5-10 years		-
Total	$	224,804