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Income Taxes (Details 2) (USD $) | 12 Months Ended
--- | ---
Dec. 28, 2013 | Dec. 29, 2012 | Dec. 31, 2011
Operating loss and tax credit carryforwards |  |  |
Net deferred tax assets (Liabilities) | $ 31,336,000 | $ 40,281,000 |
Provision for U.S. federal and state income taxes | 0 |  |
Income tax benefit reflected in earnings | (12,208,000) | (22,800,000) | (16,868,000)
Singapore |  |  |
Operating loss and tax credit carryforwards |  |  |
Income tax benefit reflected in earnings | 2,200,000 | (13,300,000) | 2,500,000
The income tax benefit per diluted share (in dollars per share) | $ 0.05 | $ (0.31) | $ 0.06
State |  |  |
Operating loss and tax credit carryforwards |  |  |
Operating loss carryforwards | 63,900,000 |  |
Research and development credit carryforwards | 11,000,000 |  |
Cygnal Integrated Products, Silicon Clocks, Spectra Linear and Ember | Federal |  |  |
Operating loss and tax credit carryforwards |  |  |
Operating loss carryforwards | 77,500,000 |  |
Research and development credit carryforwards | 2,100,000 |  |
Energy Micro |  |  |
Operating loss and tax credit carryforwards |  |  |
Net deferred tax assets (Liabilities) | 5,300,000 |  |
Energy Micro | Foreign |  |  |
Operating loss and tax credit carryforwards |  |  |
Operating loss carryforwards | $ 29,600,000 |  |

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- Definition Represents the provision for undistributed foreign earnings, upon which no federal or state taxes have been provided, that are considered to be permanently reinvested abroad, as of the balance sheet date. + References No definition available. + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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