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Note 9. Investment in Rock Ohio Ventures, LLC (Details) (USD $) In Thousands, unless otherwise specified | Sep. 29, 2013 | Dec. 30, 2012 | Sep. 30, 2012 | Sep. 30, 2013 Rock Ohio Ventures [Member] | Dec. 30, 2012 Rock Ohio Ventures [Member]
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Note 9. Investment in Rock Ohio Ventures, LLC (Details) [Line Items] |  |  |  |  |
Cost Method Investments | $ 20,997 | $ 20,161 | $ 20,200 | $ 21,000 | $ 20,200

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