Fair Value Measurements (Tables)

6 Months Ended

Nov. 30, 2025

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 November 30, 2025
Available-for-sale debt securities:
U.S. Treasury and other government	$	-	$	25,126	$	-		$	25,126
Corporate bonds		-		126		-			126
Total available-for-sale debt securities		-		25,252		-			25,252
Marketable equity securities:
Stocks – foreign		333		-		-			333
Stocks – domestic		4,463		-		-			4,463
Mutual funds – foreign		-		43,837		-			43,837
Mutual funds – domestic		-		108,028		-			108,028
Total marketable equity securities		4,796		151,865		-			156,661
Contingent consideration		-		-		(7,017	)		(7,017	)
Total	$	4,796	$	177,117	$	(7,017	)	$	174,896

(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 November 30, 2025 and May 31, 2025, is as follows:

	At November 30, 2025
(In thousands)	Carrying Value		Fair Value
Long-term debt, including current portion	$	2,519,875	$	2,446,201
	At May 31, 2025
(In thousands)	Carrying Value		Fair Value
Long-term debt, including current portion	$	2,646,613	$	2,523,202