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Balance Sheet Information (Details Textuals) (USD $)
3 Months Ended9 Months Ended
Oct. 02, 2011
Oct. 03, 2010
Oct. 02, 2011
Oct. 03, 2010
Jan. 02, 2011
Provision for Loan and Lease Losses$ 0$ 0$ 0$ 0 
Financing Receivable, Recorded Investment, Past Due$ 0 $ 0 $ 0