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Income Taxes (Details 2) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 29, 2012 | Dec. 31, 2011 | Jan. 01, 2011 | Mar. 30, 2013 High end of range Forecast | Mar. 30, 2013 Low end of range Forecast | Dec. 29, 2012 Singapore | Dec. 31, 2011 Singapore | Jan. 01, 2011 Singapore | Dec. 29, 2012 State | Dec. 29, 2012 Cygnal Integrated Products, Silicon Clocks, Spectra Linear and Ember Federal | Dec. 29, 2012 Ember
Operating loss and tax credit carryforwards |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards |  |  |  |  |  |  |  |  | $ 78,900,000 | $ 90,800,000 |
Research and development credit carryforwards |  |  |  |  |  |  |  |  | 9,900,000 | 2,000,000 |
Net deferred tax assets (Liabilities) | 40,281,000 | 30,462,000 |  |  |  |  |  |  |  |  | 15,500,000
Valuation allowance | 2,114,000 |  |  |  |  |  |  |  |  |  | 2,100,000
Income tax benefit reflected in earnings | $ (22,800,000) | $ (16,868,000) | $ (14,417,000) | $ 4,000,000 | $ 3,500,000 | $ (13,300,000) | $ 2,500,000 | $ 6,100,000 |  |  |
The income tax benefit per diluted share (in dollars per share) |  |  |  |  |  | $ (0.31) | $ 0.06 | $ 0.13 |  |  |

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