CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
May 31, 2014
May 31, 2013
May 31, 2014
May 31, 2013
Statement Of Income And Comprehensive Income [Abstract]        
Change in fair value of derivatives, Tax benefit (expense) $ 1,324 $ 10 $ 3,695 $ (147)
(Gain) loss from derivative transactions reclassified into earnings, Tax (expense) benefit 1,542 (92) 3,642 (1,526)
Change in postretirement liabilities, Taxes 1,616 0 1,616 0
Amortization of prior service cost, Taxes 8 8 24 25
Amortization of actuarial loss, Taxes $ 17 $ 209 $ 117 $ 627