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Consolidated Statements of Comprehensive Income Parenthetical - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Other Comprehensive Income [Abstract]      
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax $ (12,726) $ 8,410 $ 41,007
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax (154) 1,251 603
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax $ (1,607) $ (8,883) $ 9,551