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Consolidated Statements of Comprehensive Income Parenthetical (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Comprehensive Income Parenthetical [Abstract]      
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax $ (21,710) $ 17,776 $ (30,847)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax 199 445 (477)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax 449 (2,180) 227
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax $ (3,699) $ 2,842 $ (791)