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Postretirement and Other Employee Benefits (Accumulated Benefit Obligation in Excess of Plan Assets) (Details 8) - USD ($)
$ in Thousands
Aug. 31, 2016
Aug. 31, 2015
Postretirement and Other Employee Benefits [Abstract]    
Projected benefit obligation $ 182,278 $ 161,230
Accumulated benefit obligation 171,589 152,818
Fair value of plan assets $ 143,702 $ 134,808