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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Income Tax Examination [Line Items]      
Current Federal Tax Expense (Benefit) $ 2 $ (39) $ (1,330)
Deferred Federal Income Tax Expense (Benefit) 11,678 9,317 5,908
Current State and Local Tax Expense (Benefit) 4,505 3,657 2,312
Deferred State and Local Income Tax Expense (Benefit) 46 (4,195) (227)
Provision for income taxes 16,231 8,740 6,663
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount 17,830 10,352 8,430
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount 658 1,974 1,277
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount 3,876 2,662 2,009
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount (118) (3,334) (83)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount 0 261 0
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount (715) (75) (556)
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount (2,898) (1,313) (3,967)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount (2,241) (1,787) (144)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount (161) 0 (303)
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts 541 592  
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities 17,134 14,619  
Deferred Tax Assets, Operating Loss Carryforwards 6,445 22,623  
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other 1,285 1,764  
Deferred Tax Assets, Investments 210 210  
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost 1,079 897  
Deferred Tax Assets, Capital Loss Carryforwards 1 74  
Deferred Tax Assets, Leases 9,634 7,681  
Deferred Tax Assets, Other 2,914 2,444  
Deferred Tax Assets, Gross 39,243 50,904  
Deferred Tax Assets, Valuation Allowance 592 710  
Deferred Tax Assets, Net of Valuation Allowance 38,651 50,194  
Deferred Tax Liabilities, Property, Plant and Equipment 509 517  
Deferred Tax Liabilities, Goodwill and Intangible Assets 8,765 7,926  
Deferred Tax Liabilities, Leasing Arrangements 9,615 7,677  
Deferred Tax Liabilities, Other 753 271  
Deferred Tax Liabilities, Gross 19,642 16,391  
Deferred tax assets 19,009 33,803  
Operating Loss Carryforwards 120,248    
Operating Loss Carryforwards Attributable To Goodwill Amortization 103,681    
Deferred Tax Assets, Operating Loss Carryforwards, State and Local 61,396    
Reorganization Of Goodwill Excess Tax Basis 3,869    
Unrecognized Tax Benefits 24,861 26,294  
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions 59 111  
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 20 29  
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations 3,061 1,573  
Unrecognized Tax Benefits 21,879 24,861 $ 26,294
Increase in Unrecognized Tax Benefits is Reasonably Possible 159    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 50 $ 55  
State and Local Jurisdiction [Member]      
Income Tax Examination [Line Items]      
Operating Loss Carryforwards Attributable To Goodwill Amortization $ 5,398