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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 31, 2016 | Dec. 30, 2017 | Dec. 31, 2016 | Oct. 01, 2017 | Sep. 30, 2017
Income Tax Disclosure [Line Items] |  |  |  |  |
Effective income tax rate |  | (114.00%) | (41.00%) |  |
Income before income taxes |  | $ 6,471 | $ (6,503) |  |
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 |  | $ (2,000) | $ (7,000) |  |
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent |  | 24.50% |  |  |
Unrecognized tax benefits |  | $ 13,800 |  |  | $ 14,800
Income tax provision upon recognition of unrecognized tax benefit |  | 13,800 |  |  |
Unrecognized tax benefits that would impact valuation allowance |  | 3,900 |  |  |
Potentail reduction in unrecognized tax benefits and accrued interest over next 12 months |  | (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) |  | $ 14,200 |  |  |
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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