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Investments (Details Textual) (USD $)
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12 Months Ended | ||
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Dec. 29, 2012
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Dec. 31, 2011
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Jan. 01, 2011
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| Investments (Textual) [Abstract] | |||
| Recognized gross realized gains | $ 27,000 | ||
| Recognized gross realized losses | $ 4,000 | $ 3,000 | $ 8,000 |
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Minimum [Member]
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| Investments (Textual) [Abstract] | |||
| Auction rate preferred securities in municipal and state agencies, maturity period | 15 years | ||
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Maximum [Member]
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| Investments (Textual) [Abstract] | |||
| Auction rate preferred securities in municipal and state agencies, maturity period | 30 years | ||
| X | ||||||||||
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- Definition
Auction rate preferred securities in municipal and state agencies maturity period. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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