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Income Taxes (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2016 | Mar. 30, 2019 | Mar. 31, 2018 | Mar. 30, 2019 | Mar. 31, 2018 | Sep. 30, 2018 | Dec. 29, 2018 | Oct. 01, 2018 | Dec. 30, 2017 | Sep. 30, 2017
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Effective income tax rate |  | (30.00%) | 31.00% | (73.00%) | (21.00%) |  |  |  |  |
Income before income taxes |  | $ (33,420) | $ 11,546 | $ (12,998) | $ 18,017 |  |  |  |  |
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 |  | $ 10,300 |  | $ 9,800 |  |  |  |
Income tax provision upon recognition of unrecognized tax benefit |  | 10,300 |  | 10,300 |  |  |  |  |  |
Unrecognized tax benefits that would impact valuation allowance |  | 3,800 |  | 3,800 |  |  |  |  |  |
Potentail reduction in unrecognized tax benefits and accrued interest over next 12 months |  | (2,000) |  | (2,000) |  |  |  |  |  |
Stockholders' Equity Attributable to Parent |  | 1,247,708 | 927,724 | 1,247,708 | 927,724 | 874,589 | $ 1,321,169 |  | $ 889,099 | $ 885,436
Deferred tax assets |  | 195,884 |  | 195,884 |  | 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) |  |  |  | 14,100 |  |  |  |  |  |
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 |  | $ (182,298) | $ (629,597) | $ (182,298) | $ (629,597) | $ (599,409) | $ (138,785) |  | $ (637,519) | $ (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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