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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Effective Income Tax Rate Reconciliation, Amount      
U.S federal statutory tax rate $ 310,387 $ 259,513 $ 209,925
State and local income taxes, net of federal income tax effect 24,254 27,367 19,853
Changes in valuation allowances 0 1,106 0
Changes in unrecognized tax benefits 2,004 926 5,302
Nontaxable or nondeductible items 741 2,464 1,000
Amortization of excess deferred taxes (60,727) (100,270) (123,953)
Other, net 2,621 1,775 1,652
Income tax expense $ 279,280 $ 192,881 $ 113,779
Effective Income Tax Rate Reconciliation, Percent      
U.S federal statutory tax rate 21.00% 21.00% 21.00%
State and local income taxes, net of federal income tax effect 1.60% 2.20% 2.00%
Changes in valuation allowances 0.00% 0.10% 0.00%
Changes in unrecognized tax benefits 0.10% 0.10% 0.50%
Nontaxable or nondeductible items 0.10% 0.20% 0.10%
Amortization of excess deferred taxes (4.10%) (8.10%) (12.40%)
Other, net 0.20% 0.10% 0.20%
Income tax expense 18.90% 15.60% 11.40%