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Cash and Investments Cash and Investments Textual (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2012 | Jun. 29, 2013
Cash and Investments Additional Disclosures [Abstract] |  |
Maximum maturity period of Available-for-sale marketable securities, classified as cash equivalents |  | 90 days
Minimum maturity period of Available-for-sale marketable securities, classified as marketable securities |  | 90 days
Unrealized gains or losses on marketable securities | $ 0 | $ 0
Maximum period of available for sale securities debt maturities |  | 2 years

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- Definition Maximum maturity period of available-for-sale marketable securities, classified as cash equivalents. + References No definition available. + Details
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- Definition Maximum period of available for sale securities debt maturities. + References No definition available. + Details
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- Definition Minimum maturity period of Available-for-sale marketable securities, classified as marketable securities. + References No definition available. + Details
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- Definition The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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