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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Line Items] |  |  |  |
Reversal of AMT credits | $ 1,800 |  |  |
Change in tax rate, deferred tax asset, provisional income tax expense | 29,400 |  |  |
Tax credits | 3,569 | $ 4,399 |  |
Unrecognized tax benefits | 3,096 | 5,253 | $ 6,184 | $ 6,756
Unrecognized tax benefits that would impact effective tax rate |  | $ 1,600 |  |
Federal Tax Authority |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Operating loss carry forwards | 39,700 |  |  |
Tax credits | 3,000 |  |  |
State Tax Jurisdiction |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Operating loss carry forwards | 60,000 |  |  |
Tax credits | $ 4,200 |  |  |

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- Definition Tax Cuts And Jobs Act Of 2017, Effect of Changes In Tax Rates + References No definition available. + Details
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- Definition Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit 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 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 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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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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