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Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Qualified Pension Benefits    
Component of net periodic benefit costs: [Abstract]    
Service cost $ 10,538 $ 9,648
Interest cost 5,431 7,099
Expected return on assets (11,671) (11,242)
Prior service cost (credit) amortization 45 42
Actuarial (gain) loss amortization 5,396 3,087
Net periodic benefit cost 9,739 8,634
Non-Qualified Pension Benefits    
Component of net periodic benefit costs: [Abstract]    
Service cost 101 78
Interest cost 107 187
Expected return on assets 0 0
Prior service cost (credit) amortization (28) (19)
Actuarial (gain) loss amortization 25 0
Net periodic benefit cost 205 246
Other Benefits    
Component of net periodic benefit costs: [Abstract]    
Service cost 262 263
Interest cost 187 274
Expected return on assets 0 0
Prior service cost (credit) amortization (111) (139)
Actuarial (gain) loss amortization (348) (407)
Net periodic benefit cost $ (10) $ (9)