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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]        
Pension and Other Postretirement Benefit Liability Adjustments, Tax $ 1,803 $ 2,573 $ 3,817 $ 4,165
Unrealized gain (loss) on securities, Tax 632 (1,276) (2,595) (1,155)
Unrealized gain (loss) on derivatives, Tax Benefit $ 0 $ 75 $ 0 $ 33