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Postretirement and Other Employee Benefits (Reconciliation of Funded Status) (Details 6) - USD ($)
$ in Thousands
Aug. 31, 2016
Aug. 31, 2015
Aug. 31, 2014
Funded Status      
Ending projected benefit obligation $ (182,278) $ (161,230) $ (182,653)
Under or unfunded status (38,576) (26,422)  
Consolidated Balance Sheet Information      
Accrued benefit liability, current (383) (140)  
Accrued benefit liability, noncurrent (38,193) (26,282)  
Net liability recorded at August 31 (38,576) (26,422)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Net actuarial loss 44,155 32,986  
Prior service credit (1,255) (1,405)  
Accumulated other comprehensive loss, before taxes $ 42,900 $ 31,581