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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016
Income Taxes [Line Items] |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate | 35.00% |
Reorganization Of Goodwill Excess Tax Basis | $ 24,012 |
SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound | 3,284 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 14 | $ 11
Deferred Tax Assets, Net | 95,280 | 101,094
Uncertain Tax Benefit Net Opertating Loss From Goodwill | 50,180 | $ 50,581
2017 Business Acquisitions |  |
Income Taxes [Line Items] |  |
Goodwill Tax Basis | 3,411 |
Internal Revenue Service (IRS) [Member] |  |
Income Taxes [Line Items] |  |
Cash Tax Reduction Attributable To Additional Goodwill Amortization | 11,487 |
Operating Loss Carryforwards Attributable To Additional Goodwill Amortization | 142,052 |
Operating Loss Carryforwards | $ 378,274 |
Tax Credit Carryforward, Limitations on Use | The annual limitation under Section 382 on the utilization of federal net operating losses was approximately $20,000 for the first five tax years subsequent to the change in ownership and $16,000 thereafter. |
Carryforward Amount Excluded From Limitations on Use | $ 300,400 |
DeferredTaxAssetOffsetByDeferredTaxLiability | 6,347 |
State and Local Jurisdiction [Member] |  |
Income Taxes [Line Items] |  |
Operating Loss Carryforwards Attributable To Additional Goodwill Amortization | 6,188 |
Operating Loss Carryforwards | 77,373 |
DeferredTaxAssetOffsetByDeferredTaxLiability | 427 |
Deferred Tax Assets, Net | $ 587 |

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