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Postretirement and Other Employee Benefits (Accumulated Benefit Obligation in Excess of Plan Assets) (Details 6) - USD ($)
$ in Thousands
Aug. 31, 2017
Aug. 31, 2016
Postretirement and Other Employee Benefits [Abstract]    
Projected benefit obligation $ 167,714 $ 182,278
Accumulated benefit obligation 158,971 171,589
Fair value of plan assets $ 146,698 $ 143,702