Fair Value Measurements (Tables)

9 Months Ended

Feb. 28, 2026

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis and Categorized using Fair Value Hierarchy

The following tables present our assets and liabilities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy.

(In thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Fair Value at February 28, 2026
Available-for-sale debt securities:
U.S. Treasury and other government	$	-	$	25,442	$	-		$	25,442
Corporate bonds		-		126		-			126
Total available-for-sale debt securities		-		25,568		-			25,568
Marketable equity securities:
Stocks – foreign		354		-		-			354
Stocks – domestic		4,959		-		-			4,959
Mutual funds – foreign		-		47,539		-			47,539
Mutual funds – domestic		13,139		97,135		-			110,274
Total marketable equity securities		18,452		144,674		-			163,126
Contingent consideration		-		-		(7,058	)		(7,058	)
Total	$	18,452	$	170,242	$	(7,058	)	$	181,636

(In thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)			Fair Value at May 31, 2025
Available-for-sale debt securities:
U.S. Treasury and other government	$	-	$	24,200	$	-		$	24,200
Corporate bonds		-		123		-			123
Total available-for-sale debt securities		-		24,323		-			24,323
Marketable equity securities:
Stocks – foreign		1,265		-		-			1,265
Stocks – domestic		8,642		-		-			8,642
Mutual funds – foreign		-		38,943		-			38,943
Mutual funds – domestic		-		86,569		-			86,569
Total marketable equity securities		9,907		125,512		-			135,419
Contingent consideration		-		-		(17,252	)		(17,252	)
Total	$	9,907	$	149,835	$	(17,252	)	$	142,490

Fair Value and Carrying Value of Long-Term Debt

Based on the analysis performed, the fair value and the carrying value of our long-term debt as of February 28, 2026 and May 31, 2025, is as follows:

	At February 28, 2026
(In thousands)	Carrying Value		Fair Value
Long-term debt, including current portion	$	2,555,487	$	2,483,386
	At May 31, 2025
(In thousands)	Carrying Value		Fair Value
Long-term debt, including current portion	$	2,646,613	$	2,523,202