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Income Taxes - Altera Corp and Singapore Operations (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Income Taxes |  |  |
Net deferred tax assets | $ 35,514 | $ 36,174 |
Income tax benefit | (11,430) | 29,811 | $ 3,002
Altera decision |  |  |
Income Taxes |  |  |
Net deferred tax assets | 27,200 |  |
Singapore |  |  |
Income Taxes |  |  |
Income tax benefit | $ (5,400) | $ (11,000) | $ (7,700)
Income tax benefit (expense) per diluted share (in dollars per share) | $ 0.12 | $ 0.25 | $ 0.18

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