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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Income tax expense (benefit) | $ 2,212 |  | $ 5,973 | $ (23,015) | $ 8,462 |
Blended rate (as a percent) |  |  |  | 24.50% |  |
Provisional tax benefit change in tax rate |  |  |  | $ 29,921 |  |
Tax benefit change in deferred tax assets |  |  |  | 38,010 |  |
Tax expense repatriation of foreign earnings |  | $ 13,457 |  | 8,089 |  |
Recognition of tax benefit, foreign earnings | 5,368 |  |  |  |  |
Unrecognized tax benefits | 8,122 |  |  | 8,122 |  | $ 7,968
Unrecognized tax benefits that would impact effective tax rate | 3,635 |  |  | 3,635 |  |
Total penalties and interest accrued | $ 1,793 |  |  | $ 1,793 |  | $ 1,779

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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