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Consolidated Statements of Comprehensive Income Parenthetical (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Other Comprehensive Income (Loss), Tax, Parenthetical Disclosures [Abstract]      
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax $ 8,410 $ 41,007 $ (21,710)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax 1,251 603 199
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax (8,883) 9,551 449
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax $ (783) $ (2,383) $ (3,699)