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Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Qualified Pension Benefits    
Component of net periodic benefit costs: [Abstract]    
Service cost $ 11,307 $ 10,538
Interest cost 4,141 5,431
Expected return on assets (10,910) (11,671)
Prior service cost (credit) amortization 45 45
Actuarial loss (gain) amortization 5,447 5,396
Net periodic benefit cost (benefit) 10,030 9,739
Non-Qualified Pension Benefits    
Component of net periodic benefit costs: [Abstract]    
Service cost 108 101
Interest cost 68 107
Expected return on assets 0 0
Prior service cost (credit) amortization (28) (28)
Actuarial loss (gain) amortization 53 25
Net periodic benefit cost (benefit) 201 205
Other Benefits    
Component of net periodic benefit costs: [Abstract]    
Service cost 297 262
Interest cost 123 187
Expected return on assets 0 0
Prior service cost (credit) amortization (111) (111)
Actuarial loss (gain) amortization (341) (348)
Net periodic benefit cost (benefit) $ (32) $ (10)