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Income Taxes (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Income tax provision |  |  | $ 367 | $ 148 | $ 2,973 | $ 913
Income tax expense (benefit) specific to the period |  |  |  |  | 3,000 | $ (100)
Federal corporate tax rate | 21.00% | 35.00% |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  |  | 1,100 |  | 1,100 |
Decrease in unrecognized tax benefits that is reasonably possible |  |  | $ 100 |  | 100 |
Accounting Standards Update 2016-09 |  |  |  |  |  |
Income tax provision |  |  |  |  | 700 |
Tax Cuts and Jobs Act of 2017 |  |  |  |  |  |
Income tax provision |  |  |  |  | 2,700 |
Tax Cuts and Jobs Act of 2017, Remeasurement Of Deferred Tax |  |  |  |  |  |
Income tax provision |  |  |  |  | 2,600 |
Tax Cuts and Jobs Act of 2017, One Time Transition Tax For Foreign Subsidiaries |  |  |  |  |  |
Income tax provision |  |  |  |  | $ 100 |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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