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Cash, Cash Equivalents and Investments (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 28, 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 | 45,544,000 | 56,690,000
Cash on hand, Fair Value | 45,544,000 | 56,690,000
Cash and cash equivalents, Cost | 95,800,000 | 105,424,000
Cash and cash equivalents, Gross Unrealized Gains |  | 2,000
Cash and cash equivalents, Fair Value | 95,800,000 | 105,426,000
Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 50,256,000 | 48,734,000
Available-for-sale securities, Gross Unrealized Gains |  | 2,000
Available-for-sale securities, Fair Value | 50,256,000 | 48,736,000
Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 179,365,000 | 176,207,000
Available-for-sale securities, Gross Unrealized Losses | (15,000) | (12,000)
Available-for-sale securities, Gross Unrealized Gains | 243,000 | 370,000
Available-for-sale securities, Fair Value | 179,593,000 | 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 | (1,793,000) | (1,156,000)
Available-for-sale securities, Fair Value | 10,632,000 | 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 | 39,538,000 | 22,685,000
Available-for-sale securities, Gross Unrealized Gains |  | 1,000
Available-for-sale securities, Fair Value | 39,538,000 | 22,686,000
Certificates of deposit | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 7,768,000 |
Available-for-sale securities, Fair Value | 7,768,000 |
Commercial paper | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 2,499,000 |
Available-for-sale securities, Fair Value | 2,499,000 |
Commercial paper | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 3,748,000 |
Available-for-sale securities, Fair Value | 3,748,000 |
Municipal bonds | Cash Equivalents: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 451,000 | 1,000,000
Available-for-sale securities, Fair Value | 451,000 | 1,000,000
Municipal bonds | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 119,289,000 | 45,646,000
Available-for-sale securities, Gross Unrealized Losses | (11,000) | (7,000)
Available-for-sale securities, Gross Unrealized Gains | 182,000 | 50,000
Available-for-sale securities, Fair Value | 119,460,000 | 45,689,000
Corporate bonds | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 17,788,000 | 59,089,000
Available-for-sale securities, Gross Unrealized Losses | (4,000) | (5,000)
Available-for-sale securities, Gross Unrealized Gains | 60,000 | 267,000
Available-for-sale securities, Fair Value | 17,844,000 | 59,351,000
Variable-rate demand notes | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 38,025,000 | 41,785,000
Available-for-sale securities, Fair Value | 38,025,000 | 41,785,000
Asset-backed securities | Short-term Investments: |  |
Available-for-sale securities |  |
Available-for-sale securities, Cost | 515,000 | 15,058,000
Available-for-sale securities, Gross Unrealized Gains | 1,000 | 11,000
Available-for-sale securities, Fair Value | 516,000 | 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 |  | 1,991,000
Available-for-sale securities, Gross Unrealized Gains |  | 17,000
Available-for-sale securities, Fair Value |  | 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 | (1,793,000) | (1,156,000)
Available-for-sale securities, Fair Value | $ 10,632,000 | $ 11,369,000

X
- Definition This element represents the amount of auction-rate securities that is guaranteed by the U.S. government. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition This element represents the amount of auction-rate securities having credit rating of 'A'. + References No definition available. + Details
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Balance Type: | debit
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- Definition This element represents the amount of auction-rate securities having credit rating of 'AA'. + References No definition available. + Details
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- Definition This element represents the amount of auction-rate securities having credit rating of 'BBB'. + References No definition available. + Details
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- Definition This element represents the amount of auction-rate securities that is privately insured. + References No definition available. + Details
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- Definition Amount of accumulated unrealized gain before deducting unrealized loss on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss before deducting unrealized gain on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition This element represents the adjusted cost of cash and cash equivalents that are considered available-for-sale and recorded at fair value. + References No definition available. + Details
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- Definition This element represents the unrealized gains from cash and cash equivalents. + References No definition available. + Details
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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 investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: 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 + Details
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- Definition Fair value portion 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. 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 -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 + 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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