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Postretirement and Other Employee Benefits (Estimated Future Benefit Payments) (Details 11)
$ in Thousands
Aug. 31, 2016
USD ($)
Postretirement and Other Employee Benefits [Abstract]  
2017 $ 4,669
2018 4,605
2019 5,656
2020 5,765
2021 5,309
Years 2022 through 2026 $ 35,745