Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013	Nov. 30, 2012
Pension and Other Postretirement Benefit Liability Adjustments, Tax	$ 1,379	$ 1,885	$ 2,811	$ 2,635
Unrealized gain on securities, Tax	2,882	996	2,062	707
Unrealized gain on derivatives, Tax Benefit	$ 324	$ 272	$ 278	$ 164