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Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2023
May 31, 2022
May 31, 2023
May 31, 2022
Qualified Pension Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost $ 9,645 $ 11,569 $ 28,934 $ 34,706
Interest cost 7,647 4,292 22,941 12,875
Expected return on assets (10,782) (10,990) (32,347) (32,969)
Prior service cost (credit) amortization 37 44 112 131
Actuarial loss (gain) amortization 468 5,852 1,404 17,555
Net periodic benefit cost (benefit) 7,015 10,767 21,044 32,298
Non-Qualified Pension Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost 460 232 1,380 695
Interest cost 185 70 556 211
Expected return on assets 0 0 0 0
Prior service cost (credit) amortization (29) (29) (86) (86)
Actuarial loss (gain) amortization 61 120 184 359
Net periodic benefit cost (benefit) 677 393 2,034 1,179
Other Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost 168 249 503 747
Interest cost 259 126 776 377
Expected return on assets 0 0 0 0
Prior service cost (credit) amortization (111) (111) (334) (334)
Actuarial loss (gain) amortization (404) (315) (1,211) (944)
Net periodic benefit cost (benefit) $ (88) $ (51) $ (266) $ (154)