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Income Taxes - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Income Tax Contingency [Line Items] |  |  |  |  |  |
Federal net operating loss carryforwards |  |  | $ 133,200,000 |  |  |
State net operating loss carryforwards |  |  | 39,600,000 |  |  |
Alternative minimum tax credit |  |  | 9,600,000 |  |  |
General business credits |  |  | 17,700,000 |  |  |
Income tax expense (benefit) from continuing operations |  |  | 94,484,000 | $ 2,696,000 | $ 16,498,000 |
Pre-tax income required to realize deferred tax assets prior to expiration |  |  | 768,000,000 |  |  |
Deferred tax asset valuation allowance | $ 65,159,000 |  | 34,212,000 | 65,159,000 |  |
Unrecognized tax benefits | 3,804,000 | $ 4,541,000 | 3,494,000 | 3,804,000 | 4,541,000 | $ 4,721,000
Accrued interest and penalties | 1,400 |  | 1,300 | 1,400 |  |
Uncertain tax positions to be reserved within twelve months |  |  | $ 21,600 |  |  |
State and Local Jurisdiction |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Valuation allowances and reserves, adjustments | $ 27,400,000 | $ 8,600,000 |  | $ 3,500,000 | $ 8,600,000 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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