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Benefit Plans - Schedule of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2026
May 31, 2025
May 31, 2026
May 31, 2025
Pension Benefits | Qualified        
Components of net periodic benefit costs:        
Service cost $ 11,348 $ 10,932 $ 34,043 $ 32,795
Interest cost 9,027 8,725 27,080 26,174
Expected return on assets (12,579) (11,744) (37,737) (35,232)
Prior service (credit) cost amortization (149) 50 (446) 149
Actuarial loss (gain) amortization 4,125 3,204 12,374 9,611
Net periodic benefit cost 11,772 11,167 35,314 33,497
Pension Benefits | Nonqualified        
Components of net periodic benefit costs:        
Service cost 831 757 2,494 2,270
Interest cost 335 289 1,005 866
Expected return on assets 0 0 0 0
Prior service (credit) cost amortization (8) (12) (23) (35)
Actuarial loss (gain) amortization 246 200 737 599
Net periodic benefit cost 1,404 1,234 4,213 3,700
Other Benefits        
Components of net periodic benefit costs:        
Service cost 210 211 630 633
Interest cost 281 285 844 855
Expected return on assets 0 0 0 0
Prior service (credit) cost amortization (111) (111) (334) (334)
Actuarial loss (gain) amortization (299) (309) (898) (926)
Net periodic benefit cost $ 81 $ 76 $ 242 $ 228