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Income Taxes - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 17, 2018 | Dec. 28, 2019 | Dec. 29, 2018 | Sep. 29, 2018 | Dec. 30, 2017 | Dec. 28, 2019 | Dec. 29, 2018 | Jan. 17, 2018 | Dec. 30, 2017
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) |  |  |  |  |  | $ 3,300 |  |  |
Provisional estimate of Tax Act |  |  |  |  | $ 47,000 |  |  |  |
Preliminary estimate of toll charge |  |  |  |  | 49,000 |  |  |  | $ 49,000
Other net tax benefits |  |  |  |  | (2,000) |  |  |  |
TCJA one-time charge |  |  | $ 3,200 |  |  |  |  |  |
Toll charge, noncurrent |  |  |  |  |  | 23,800 |  |  |
Toll charge, current |  |  |  |  |  | 3,000 |  |  |
Benefit for previously unrecognized tax benefits in respect of which the statute of limitation has expired |  | $ 3,300 | 1,500 |  |  | 2,758 | $ 1,257 |  |
Foreign tax credits |  |  |  |  |  |  |  |  | 13,000
Income taxes paid |  |  |  |  |  | 47,600 | 46,200 |  | 31,800
Income tax refunds |  |  |  |  |  | 7,100 | 4,300 |  | 13,700
Unremitted earnings of the Company’s non-U.S. subsidiaries |  | 776,000 |  |  |  | 776,000 |  |  |
Deferred tax liabilities recognized on foreign earnings |  | 13,000 | 12,700 |  |  | $ 13,000 | 12,700 |  |
Income tax holiday per diluted share (in dollars per share) |  |  |  |  |  | $ 0.17 |  |  |
Interest expense |  |  |  |  |  | $ 1,300 | 1,500 |  | 900
Decrease due to a lapse in the statute of limitations |  |  |  |  |  | 600 | 300 |  |
Interest accrued |  | 7,200 | 5,900 |  |  | 7,200 | 5,900 |  |
Unrecognized tax benefits |  | 16,721 | 18,259 |  | $ 7,660 | 16,721 | 18,259 |  | $ 7,660
Unrecognized tax benefits that may be recognized in next fiscal year |  | 100 |  |  |  | 100 |  |  |
China |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Tax holidays |  |  |  |  |  | 4,200 |  |  |
Foreign Tax Authority |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax liabilities recognized on foreign earnings |  | 12,600 | 12,500 |  |  | 12,600 | 12,500 |  |
Domestic Tax Authority |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax liabilities recognized on foreign earnings |  | $ 400 | 200 |  |  | $ 400 | $ 200 |  |
Toll Charge |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
TCJA one-time charge |  |  | 2,300 |  |  |  |  |  |
Toll Charge | IXYS Corporation |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
TCJA one-time charge | $ 7,000 |  | (1,000) | $ (2,000) |  |  |  | $ 7,000 |
Other Items |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
TCJA one-time charge |  |  | $ 900 |  |  |  |  |  |

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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity referred as other than Toll charge. + References No definition available. + Details
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