Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Tax Examination [Line Items]
Deferred Tax Assets, Net of Valuation Allowance	$ 48,427	$ 53,777
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	93	13
Reorganization Of Goodwill Excess Tax Basis	23,050
Unrecognized Tax Benefits	30,256	51,968
Unrecognized Tax Benefits	26,294	30,256	$ 51,968
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	19	272
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	4,074	3,361
Unrecognized tax benefits reductions rate change	0	18,636
Operating Loss Carryforwards Attributable To Goodwill Amortization	143,577
Increase in Unrecognized Tax Benefits is Reasonably Possible	1,573
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	43	35
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	245	207
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	9,783	8,054
Deferred Tax Assets, Operating Loss Carryforwards	39,045	46,881
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	1,396	1,172
Deferred Tax Assets, Investments	119	119
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	672	665
Deferred Tax Assets, Capital Loss Carryforwards	74	94
Deferred Tax Assets, Other	1,137	712
Deferred Tax Assets, Valuation Allowance	4,044	4,127
Deferred Tax Assets, Gross	52,471	57,904
Deferred Tax Liabilities, Property, Plant and Equipment	840	1,122
Deferred Tax Liabilities, Goodwill and Intangible Assets	5,978	5,499
Deferred Tax Liabilities, Other	735	576
Deferred Tax Liabilities, Gross	7,553	7,197
Deferred tax assets	$ 40,874	$ 46,580
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	24.53%	35.00%
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 8,430	$ 5,973	$ 6,582
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount	1,277	1,241	1,173
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	2,009	1,193	1,003
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	(83)	1,761	142
Operating Loss Carryforwards	306,324
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	94,007
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		31,333
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	0	183	17
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount	(556)	(238)	(207)
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount	(3,967)	(1,908)	(3,499)
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount	0	(1,387)	0
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	(447)	0	0
Current Federal Tax Expense (Benefit)	(1,330)	(2,345)	(3,092)
Deferred Federal Income Tax Expense (Benefit)	5,908	38,744	6,384
Current State and Local Tax Expense (Benefit)	2,312	1,536	1,432
Deferred State and Local Income Tax Expense (Benefit)	(227)	216	487
Provision for (benefit from) income taxes	6,663	$ 38,151	$ 5,211
State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
Operating Loss Carryforwards Attributable To Goodwill Amortization	$ 8,722