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Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Qualified Pension Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost $ 11,307 $ 10,538 $ 33,921 $ 31,613
Interest cost 4,141 5,431 12,422 16,292
Expected return on assets (10,910) (11,671) (32,731) (35,013)
Prior service cost (credit) amortization 45 45 134 134
Actuarial loss (gain) amortization 5,447 5,396 16,342 16,187
Net periodic benefit cost (benefit) 10,030 9,739 30,088 29,213
Non-Qualified Pension Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost 108 101 325 304
Interest cost 68 107 205 322
Expected return on assets 0 0 0 0
Prior service cost (credit) amortization (28) (28) (85) (85)
Actuarial loss (gain) amortization 53 25 159 74
Net periodic benefit cost (benefit) 201 205 604 615
Other Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost 297 262 890 787
Interest cost 123 187 369 560
Expected return on assets 0 0 0 0
Prior service cost (credit) amortization (111) (111) (334) (334)
Actuarial loss (gain) amortization (341) (348) (1,024) (1,044)
Net periodic benefit cost (benefit) $ (32) $ (10) $ (99) $ (31)