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Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2022
May 31, 2021
May 31, 2022
May 31, 2021
Qualified Pension Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost $ 11,569 $ 11,307 $ 34,706 $ 33,921
Interest cost 4,292 4,141 12,875 12,422
Expected return on assets (10,990) (10,910) (32,969) (32,731)
Prior service cost (credit) amortization 44 45 131 134
Actuarial loss (gain) amortization 5,852 5,447 17,555 16,342
Net periodic benefit cost (benefit) 10,767 10,030 32,298 30,088
Non-Qualified Pension Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost 232 108 695 325
Interest cost 70 68 211 205
Expected return on assets 0 0 0 0
Prior service cost (credit) amortization (29) (28) (86) (85)
Actuarial loss (gain) amortization 120 53 359 159
Net periodic benefit cost (benefit) 393 201 1,179 604
Other Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost 249 297 747 890
Interest cost 126 123 377 369
Expected return on assets 0 0 0 0
Prior service cost (credit) amortization (111) (111) (334) (334)
Actuarial loss (gain) amortization (315) (341) (944) (1,024)
Net periodic benefit cost (benefit) $ (51) $ (32) $ (154) $ (99)