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Acquisitions (Details) (USD $) Share data in Millions, unless otherwise specified | 12 Months Ended |  | 12 Months Ended | 0 Months Ended |  | 0 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  | 1 Months Ended |  | 12 Months Ended |  | 0 Months Ended
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Dec. 28, 2013 | Dec. 29, 2012 | Dec. 31, 2011 | Dec. 28, 2013 Customer relationships | Dec. 28, 2013 Trademarks | Oct. 17, 2013 Energy Micro | Jul. 01, 2013 Energy Micro | Dec. 28, 2013 Energy Micro | Jul. 01, 2013 Energy Micro Core and developed technology | Jul. 01, 2013 Energy Micro Customer relationships | Jul. 01, 2013 Energy Micro Trademarks | Dec. 28, 2013 Energy Micro In-process research and development | Jul. 01, 2013 Energy Micro In-process research and development | Jul. 03, 2012 Ember | Jul. 03, 2012 Ember Developed technology | Jul. 03, 2012 Ember Customer relationships | Jul. 03, 2012 Ember Trademarks | Dec. 28, 2013 Ember In-process research and development | Jul. 03, 2012 Ember In-process research and development | Sep. 30, 2012 Corporate Headquarters Buildings item | Sep. 30, 2012 400 WCC | Sep. 30, 2012 200 WCC | Dec. 31, 2011 Spectra Linear | Jan. 25, 2011 Spectra Linear | Jan. 25, 2011 Spectra Linear Core and developed technology | Jan. 25, 2011 Spectra Linear Customer relationships
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of acquisition |  |  |  |  |  |  | $ 140,600,000 |  |  |  |  |  |  | $ 79,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  | 1,000,000 |  |
Initial consideration |  |  |  |  |  | 107,400,000 | 107,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred consideration in the form of a promissory note, fair value |  |  |  |  |  |  | 19,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock exchanged of promissory note in form of deferred consideration on acquisition |  |  |  |  |  |  | 0.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatory period of creditor notice after which the deferred consideration in the form of a promissory note will be exchanged for the entity's restricted stock |  |  |  |  |  |  | 2 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-Out, fair value | 12,919,000 |  |  |  |  |  | 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional consideration on acquisition |  |  |  |  |  | 33,300,000 | 33,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum annual revenue growth for additional consideration (as a percent) |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn out period |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum annual Earn-Out payment |  |  |  |  |  |  | 6,666,666 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum revenue in single fiscal year from Earn-Out products required to make the entire Earn-Out amount payable |  |  |  |  |  |  | 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of initial consideration held in escrow by the company as security for breaches of representations and warranties and certain other expressly enumerated matters |  |  |  |  |  | 20,300,000 | 20,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Earn-Out contingent on the continued employment of certain key employees |  |  |  |  |  |  | 28.76% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of continued employment of key employees for calculating Earn-out portion following acquisition date |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 |  |
Post combination expenses, additional compensation paid to employees of acquired entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,500,000 |  |  |
Purchase price allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | 55,400,000 |  | 29,100,000 | 6,400,000 | 1,300,000 |  | 18,600,000 | 39,140,000 | 17,800,000 | 5,620,000 | 910,000 |  | 14,810,000 |  |  |  |  | 17,960,000 | 16,560,000 | 1,400,000
Cash and cash equivalents |  |  |  |  |  |  | 919,000 |  |  |  |  |  |  | 3,115,000 |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,928,000 |  |  |  |  |  |  |  |  |  | 1,759,000 |  |
Inventories |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,749,000 |  |  |  |  |  |  |  |  |  | 1,199,000 |  |
Other current assets |  |  |  |  |  |  | 6,486,000 |  |  |  |  |  |  | 324,000 |  |  |  |  |  |  |  |  |  | 1,658,000 |  |
Goodwill | 228,781,000 | 130,265,000 | 115,489,000 |  |  |  | 98,515,000 |  |  |  |  |  |  | 14,777,000 |  |  |  |  |  |  |  |  |  | 4,097,000 |  |
Deferred tax assets - non-current |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,449,000 |  |  |  |  |  |  |  |  |  | 12,316,000 |  |
Other non-current assets |  |  |  |  |  |  | 3,117,000 |  |  |  |  |  |  | 1,776,000 |  |  |  |  |  |  |  |  |  | 597,000 |  |
Notes payable - current portion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,641,000) |  |
Current liabilities |  |  |  |  |  |  | (8,000,000) |  |  |  |  |  |  | (3,287,000) |  |  |  |  |  |  |  |  |  | (3,112,000) |  |
Non-current deferred tax liabilities, net |  |  |  |  |  |  | (6,288,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  | (8,434,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-current liabilities |  |  |  |  |  |  | (1,133,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,254,000) |  |
Total purchase price |  |  |  |  |  |  | 140,582,000 |  |  |  |  |  |  | 78,971,000 |  |  |  |  |  | 94,350,000 |  |  |  | 28,579,000 |  |
Acquisition-related costs recorded in selling, general and administrative expenses |  |  |  |  |  |  |  | 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Amortization Period | 9 years |  |  | 9 years | 10 years |  |  |  | 7 years | 8 years | 8 years |  |  |  | 11 years | 9 years | 12 years |  |  |  |  |  |  |  | 10 years | 10 years
Discount rate applicable to the cash flows (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 13.00% |  |  |  |  |  | 12.50% |  |  |  |  |  |  |  |
Purchase option price for buildings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44,300,000 | 50,100,000 |  |  |  |
Buildings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,900,000 |  |  |  |  |  |
Leasehold interest in ground leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,840,000 |  |  |  |  |  |
Acquired unfavorable leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,925,000) |  |  |  |  |  |
Lease-related charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,000) |  |  |  |  |  |
Net gain on purchase |  | $ (8,457,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (8,457,000) |  |  |  |  |  |
Useful life of building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 years |  |  |  |  |  |
Useful life of leasehold interest in ground leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 86 years |  |  |  |  |  |
Number of leases for which purchase prices were fixed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |

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- Definition The amount of acquisition cost of a business combination allocated to the noncurrent portion as of the balance sheet date of the aggregate carrying amount of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; after the valuation allowance, if any, to reduce such amount to net realizable value. + References No definition available. + Details
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- Definition Amount of notes payable due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References No definition available. + Details
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6571-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6527-128477 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6396-128476 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6387-128476 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6393-128476 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition The amount, measured at acquisition-date fair value, of all liabilities assumed that arise from contingencies and were recognized by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition The amount of inventory recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition Amount of liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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