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Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Feb. 28, 2025
Feb. 29, 2024
Feb. 28, 2025
Feb. 29, 2024
Qualified Pension Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost $ 10,932 $ 9,348 $ 21,864 $ 18,696
Interest cost 8,725 8,982 17,449 17,964
Expected return on assets (11,744) (11,965) (23,488) (23,930)
Prior service cost (credit) amortization 50 45 100 89
Actuarial loss (gain) amortization 3,204 449 6,408 898
Net periodic benefit cost (benefit) 11,167 6,859 22,333 13,717
Non-Qualified Pension Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost 757 492 1,514 984
Interest cost 289 261 577 522
Expected return on assets 0 0 0 0
Prior service cost (credit) amortization (12) (29) (24) (57)
Actuarial loss (gain) amortization 200 95 400 190
Net periodic benefit cost (benefit) 1,234 819 2,467 1,639
Other Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost 211 163 422 325
Interest cost 285 286 570 572
Expected return on assets 0 0 0 0
Prior service cost (credit) amortization (111) (111) (223) (223)
Actuarial loss (gain) amortization (309) (404) (617) (808)
Net periodic benefit cost (benefit) $ 76 $ (66) $ 152 $ (134)