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Cash, Cash Equivalents and Investments (Details) (USD $) | 6 Months Ended |
--- | --- | ---
Jun. 29, 2013 | Dec. 29, 2012
Cash, Cash Equivalents and Investments |  |
Auction-rate securities guaranteed by the U.S. government | $ 10,400,000 |
Auction-rate securities privately insured | 2,000,000 |
Auction-rate securities having credit rating 'AA' | 6,000,000 |
Auction-rate securities having credit rating 'A' | 2,000,000 |
Auction-rate securities having credit rating 'BBB' | 4,400,000 |
Other-than-temporary impairment losses | 0 |
Cash on hand, Cost | 67,854,000 | 56,690,000
Cash on hand, Fair Value | 67,854,000 | 56,690,000
Cash and cash equivalents, Cost | 193,468,000 | 105,424,000
Cash and cash equivalents, Gross Unrealized Gains |  | 2,000
Cash and cash equivalents, Fair Value | 193,468,000 | 105,426,000
Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 125,614,000 | 48,734,000
Available-for-sale securities, Gross Unrealized Gains |  | 2,000
Available-for-sale securities, Fair Value | 125,614,000 | 48,736,000
Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 151,431,000 | 176,207,000
Available-for-sale securities, Gross Unrealized Losses | (96,000) | (12,000)
Available-for-sale securities, Gross Unrealized Gains | 88,000 | 370,000
Available-for-sale securities, Fair Value | 151,423,000 | 176,565,000
Long-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 12,425,000 | 12,525,000
Available-for-sale securities, Gross Unrealized Losses | (2,228,000) | (1,156,000)
Available-for-sale securities, Fair Value | 10,197,000 | 11,369,000
U.S. Treasury bills | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost |  | 25,049,000
Available-for-sale securities, Gross Unrealized Gains |  | 1,000
Available-for-sale securities, Fair Value |  | 25,050,000
Money market funds | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 119,064,000 | 22,685,000
Available-for-sale securities, Gross Unrealized Gains |  | 1,000
Available-for-sale securities, Fair Value | 119,064,000 | 22,686,000
Certificates of deposit | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 5,550,000 |
Available-for-sale securities, Fair Value | 5,550,000 |
Certificates of deposit | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 1,858,000 |
Available-for-sale securities, Fair Value | 1,858,000 |
Commercial paper | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 1,000,000 |
Available-for-sale securities, Fair Value | 1,000,000 |
Corporate bonds | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 13,040,000 | 59,089,000
Available-for-sale securities, Gross Unrealized Losses | (1,000) | (5,000)
Available-for-sale securities, Gross Unrealized Gains | 38,000 | 267,000
Available-for-sale securities, Fair Value | 13,077,000 | 59,351,000
Municipal bonds | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost |  | 1,000,000
Available-for-sale securities, Fair Value |  | 1,000,000
Municipal bonds | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 79,400,000 | 45,646,000
Available-for-sale securities, Gross Unrealized Losses | (95,000) | (7,000)
Available-for-sale securities, Gross Unrealized Gains | 50,000 | 50,000
Available-for-sale securities, Fair Value | 79,355,000 | 45,689,000
Variable-rate demand notes | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 56,007,000 | 41,785,000
Available-for-sale securities, Fair Value | 56,007,000 | 41,785,000
Asset-backed securities | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost |  | 15,058,000
Available-for-sale securities, Gross Unrealized Gains |  | 11,000
Available-for-sale securities, Fair Value |  | 15,069,000
U.S. government bonds | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost |  | 12,638,000
Available-for-sale securities, Gross Unrealized Gains |  | 25,000
Available-for-sale securities, Fair Value |  | 12,663,000
International government bonds | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 1,126,000 | 1,991,000
Available-for-sale securities, Gross Unrealized Gains |  | 17,000
Available-for-sale securities, Fair Value | 1,126,000 | 2,008,000
Auction rate securities | Long-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 12,425,000 | 12,525,000
Available-for-sale securities, Gross Unrealized Losses | (2,228,000) | (1,156,000)
Available-for-sale securities, Fair Value | $ 10,197,000 | $ 11,369,000

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8 -Footnote 2 -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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 8, 9, 10 -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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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 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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