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Postretirement and Other Employee Benefits (Estimated Future Benefit Payments) (Details 7)
$ in Thousands
Aug. 31, 2017
USD ($)
Postretirement and Other Employee Benefits [Abstract]  
2018 $ 4,245
2019 4,438
2020 5,249
2021 4,759
2022 5,182
Years 2023 through 2027 $ 32,743