Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Examination [Line Items]
Current Federal Tax Expense (Benefit)	$ (39)	$ (1,330)	$ (2,345)
Deferred Federal Income Tax Expense (Benefit)	9,317	5,908	38,744
Current State and Local Tax Expense (Benefit)	3,657	2,312	1,536
Deferred State and Local Income Tax Expense (Benefit)	(4,195)	(227)	216
Provision for income taxes	8,740	6,663	38,151
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	10,352	8,430	5,973
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount	1,974	1,277	1,241
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	2,662	2,009	1,193
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	(3,334)	(83)	1,761
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	0	0	31,333
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	261	0	183
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount	(75)	(556)	(238)
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount	(1,313)	(3,967)	(1,908)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount	(1,787)	(144)
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount	0	0	(1,387)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	$ 0	$ (303)	$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	24.53%
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	$ 592	$ 245
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	14,619	9,783
Deferred Tax Assets, Operating Loss Carryforwards	22,623	39,045
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	1,764	1,396
Deferred Tax Assets, Investments	210	119
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	897	672
Deferred Tax Assets, Capital Loss Carryforwards	74	74
Deferred Tax Assets, Leases	7,681
Deferred Tax Assets, Other	2,444	1,137
Deferred Tax Assets, Gross	50,904	52,471
Deferred Tax Assets, Valuation Allowance	710	4,044
Deferred Tax Assets, Net of Valuation Allowance	50,194	48,427
Deferred Tax Liabilities, Property, Plant and Equipment	517	840
Deferred Tax Liabilities, Goodwill and Intangible Assets	7,926	5,978
Deferred Tax Liabilities, Leasing Arrangements	7,677
Deferred Tax Liabilities, Other	271	735
Deferred Tax Liabilities, Gross	16,391	7,553
Deferred tax assets	33,803	40,874
Operating Loss Carryforwards	217,328
Operating Loss Carryforwards Attributable To Goodwill Amortization	128,044
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	76,055
Reorganization Of Goodwill Excess Tax Basis	14,539
Unrecognized Tax Benefits	26,294	30,256
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	111	93
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	29	19
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	1,573	4,074
Unrecognized Tax Benefits	24,861	26,294	$ 30,256
Increase in Unrecognized Tax Benefits is Reasonably Possible	3,061
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	55	$ 43
State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
Operating Loss Carryforwards Attributable To Goodwill Amortization	$ 6,696