Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2014	Feb. 28, 2013
Pension and Other Postretirement Benefit Liability Adjustments, Tax	$ 1,993	$ 2,819	$ 4,751	$ 5,498
Unrealized gain on securities, Tax	(998)	220	961	1,527
Unrealized gain on derivatives, Tax Benefit	$ (159)	$ 157	$ (437)	$ (11)