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Income Taxes (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2016 | Dec. 29, 2018 | Dec. 30, 2017 | Oct. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Effective income tax rate |  | (3.00%) | (114.00%) |  |  |
Income before income taxes |  | $ 20,423 | $ 6,471 |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% |  |  |  |
Valuation Allowance, Deferred Tax Asset, Explanation of Change |  | 1.8 |  |  |  |
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent |  |  | 24.50% |  |  |
Operating Loss Carryforwards, Limitations on Use |  | 0.8 |  |  |  |
Unrecognized tax benefits |  | $ 10,300 |  |  | $ 9,800 |
Income tax provision upon recognition of unrecognized tax benefit |  | 10,300 |  |  |  |
Unrecognized tax benefits that would impact valuation allowance |  | 3,800 |  |  |  |
Potentail reduction in unrecognized tax benefits and accrued interest over next 12 months |  | (2,000) |  |  |  |
Stockholders' Equity Attributable to Parent |  | 1,321,169 | $ 889,099 |  | 874,589 | $ 885,436
Deferred tax assets |  | 201,149 |  |  | 165,566 |
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) |  | 1,500 | 7,100 |  |  |
Net Decrease in Deferred Tax Liability [Member] |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Deferred Income Tax Expense (Benefit) |  | 14,200 |  |  |  |
Accounting Standards Update 2016-16 |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Deferred tax assets |  |  |  | $ 75,300 |  |
Other Tax Assets |  |  |  | 6,000 |  |
Other Tax Liabilities |  |  |  | 3,000 |  |
Accumulated Deficit |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Stockholders' Equity Attributable to Parent |  | $ (138,785) | $ (637,519) |  | $ (599,409) | $ (650,840)
Accumulated Deficit | Accounting Standards Update 2016-16 |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Stockholders' Equity Attributable to Parent |  |  |  | $ 72,300 |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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