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Income Taxes (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 21, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017
Subsequent Event [Line Items] |  |  |  |  |
Income tax expense (benefit) |  |  | $ (25,227) | $ 2,489 |
Blended rate (as a percent) |  |  | 24.50% |  |
Federal statutory rate (as a percent) |  | 35.00% |  |  |
Provisional tax benefit change in tax rate |  |  | $ 24,553 |  |
Tax benefit change in deferred tax assets |  |  | 38,010 |  |
Tax expense repatriation of foreign earnings |  |  | 13,457 |  |
Unrecognized tax benefits |  |  | 7,994 |  | $ 7,968
Unrecognized tax benefits that would impact effective tax rate |  |  | 3,699 |  |
Total penalties and interest accrued |  |  | $ 1,786 |  | $ 1,779
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Federal statutory rate (as a percent) | 21.00% |  |  |  |

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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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- 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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