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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2016 | Mar. 31, 2018 | Apr. 01, 2017 | Mar. 31, 2018 | Apr. 01, 2017 | Oct. 01, 2017 | Sep. 30, 2017
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Effective income tax rate |  | 31.00% | (5.00%) | (21.00%) | (36.00%) |  |
Income before income taxes |  | $ 11,546 | $ (1,056) | $ 18,017 | $ (7,559) |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 21.00% | 35.00% |  |
Operating Loss Carryforwards, Limitations on Use |  |  |  | 0.8 |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  | (7,000) | $ (4,000) | $ (9,000) | $ (12,000) |  |
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent |  |  |  | 24.50% |  |  |
Unrecognized tax benefits |  | 14,300 |  | $ 14,300 |  |  | $ 14,800
Income tax provision upon recognition of unrecognized tax benefit |  | 14,300 |  | 14,300 |  |  |
Unrecognized tax benefits that would impact valuation allowance |  | 3,900 |  | 3,900 |  |  |
Potentail reduction in unrecognized tax benefits and accrued interest over next 12 months |  | $ (7,000) |  | (7,000) |  |  |
Korea |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Income tax examination, estimate of possible loss | $ 12,000 |  |  |  |  |  |
US Tax on Undistributed Foreign Earnings [Member] |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Current Federal, State and Local, Tax Expense (Benefit) |  |  |  | 7,100 |  |  |
Net Decrease in Deferred Tax Liability [Member] |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Deferred Income Tax Expense (Benefit) |  |  |  | $ 14,100 |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Windfall Tax Deductions Not Yet Recognized |  |  |  |  |  | $ 37,000 |
Windfall Tax Deductions Not Yet Recognized Offset Valuation Allowance |  |  |  |  |  | $ 36,900 |

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- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 3: 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 Reference 4: 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.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
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