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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Income Tax Examination [Line Items]      
Current Federal Tax Expense (Benefit) $ 72,037 $ 53,318 $ 27,205
Deferred Federal Income Tax Expense (Benefit) 6,184 2,672 4,300
Current State and Local Tax Expense (Benefit) 18,150 14,603 6,370
Deferred State and Local Income Tax Expense (Benefit) 434 1,572 886
Provision for income taxes 96,805 72,165 38,761
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount 85,817 63,980 33,295
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount 2,952 2,235 1,634
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount 14,325 11,952 6,338
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount 0 0 396
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount (72) 138 (52)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount 850 743 0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount (682) (601) (332)
Noncontrolling interest 1,232 2,811 2,415
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount (9,671) (5,521) 0
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount 0 0 (486)
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts 1,016 371  
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities 21,213 19,415  
Deferred Tax Assets, Operating Loss Carryforwards 2,439 2,701  
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other 3,564 2,073  
Deferred Tax Assets, Goodwill and Intangible Assets 7,913 390  
Deferred Tax Assets, Investment in Subsidiaries 600 7,200  
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost 1,570 1,364  
Deferred Tax Assets, Leases 18,981 15,630  
Deferred Tax Assets, Other 2,706 1,068  
Deferred Tax Assets, Gross 60,002 50,212  
Deferred Tax Assets, Valuation Allowance 889 961  
Deferred Tax Assets, Net of Valuation Allowance 59,113 49,251  
Deferred Tax Liabilities, Property, Plant and Equipment 18,182 10,319  
Deferred Tax Liabilities, Leasing Arrangements 18,832 15,475  
Deferred Tax Liabilities, Investments 3,275 0  
Deferred Tax Liabilities, Other 2,769 999  
Deferred Tax Liabilities, Gross 43,058 26,793  
Deferred tax assets 16,055 22,458  
Operating Loss Carryforwards 3,785    
Deferred Tax Assets, Operating Loss Carryforwards, State and Local 41,689    
Unrecognized Tax Benefits 16,881 22,347  
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 560 1,655  
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations (11,466) (7,121)  
Unrecognized Tax Benefits 5,975 16,881 22,347
Increase in Unrecognized Tax Benefits is Reasonably Possible 2,855    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 1,017 1,452  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 5,637    
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Compensation $ 4,518 $ 2,050 $ 383
State and Local Jurisdiction [Member]      
Income Tax Examination [Line Items]      
Operating Loss Carryforwards, Limitations on Use 709