Long-Term Debt and Derivatives (Tables)

12 Months Ended

May. 31, 2015

Debt Disclosure [Abstract]

Schedule of Debt

(In thousands)	2015		2014
Unsecured term notes due through 2036 at an average rate of 4.6%	$	1,300,000	$	1,300,980
Less: amounts due within one year	—		503
	$	1,300,000	$	1,300,477