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Postretirement and Other Employee Benefits (Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2020
May 31, 2019
May 31, 2020
May 31, 2019
Retirement Benefits [Abstract]        
Service cost $ 6,701 $ 381 $ 17,802 $ 965
Interest cost 755 987 2,327 2,742
Expected long-term return on plan assets (3,741) (1,344) (10,316) (4,026)
Recognized actuarial loss 225 203 674 616
Amortization of prior service credit (11) (11) (33) (34)
Net periodic benefit cost $ 3,929 $ 216 $ 10,454 $ 263