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Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2025
May 31, 2024
May 31, 2025
May 31, 2024
Qualified Pension Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost $ 10,932 $ 9,348 $ 32,795 $ 28,044
Interest cost 8,725 8,982 26,174 26,946
Expected return on assets (11,744) (11,965) (35,232) (35,895)
Prior service cost (credit) amortization 50 45 149 134
Actuarial loss (gain) amortization 3,204 449 9,611 1,347
Net periodic benefit cost (benefit) 11,167 6,859 33,497 20,576
Non-Qualified Pension Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost 757 492 2,270 1,476
Interest cost 289 261 866 783
Expected return on assets 0 0 0 0
Prior service cost (credit) amortization (12) (29) (35) (86)
Actuarial loss (gain) amortization 200 95 599 285
Net periodic benefit cost (benefit) 1,234 819 3,700 2,458
Other Benefits        
Component of net periodic benefit costs: [Abstract]        
Service cost 211 163 633 488
Interest cost 285 286 855 858
Expected return on assets 0 0 0 0
Prior service cost (credit) amortization (111) (111) (334) (334)
Actuarial loss (gain) amortization (309) (404) (926) (1,212)
Net periodic benefit cost (benefit) $ 76 $ (66) $ 228 $ (200)