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Income Taxes - Additional Information (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Tax Credit Carryforward [Line Items] |  |  |
One-time tax benefit | $ 13,400,000 |  |
Valuation allowance | 0 |  |
Unrecognized tax benefits that would impact tax expense | 10,700,000 |  |
Uncertain tax positions, interest and penalties | 300,000 | $ 500,000 | $ 100,000
Interest and penalties accrued | 1,400,000 | $ 1,100,000 | $ 600,000
Internal Revenue Service (IRS) |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Net operating loss | 6,600,000 |  |
State and Local Jurisdiction |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Net operating loss | 6,100,000 |  |
Research Tax Credit Carryforward | Internal Revenue Service (IRS) |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax credit carryforward amount | 2,400,000 |  |
Research Tax Credit Carryforward | State and Local Jurisdiction |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax credit carryforward amount | $ 8,800,000 |  |

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- Definition Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + 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=65882285&loc=d3e32559-109319 + Details
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- Definition The amount of the tax credit 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=65882285&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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