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Balance Sheet Information (Details Textuals) (USD $)	12 Months Ended
Balance Sheet Information (Details Textuals) (USD $)	Jan. 01, 2012	Jan. 02, 2011	Jan. 03, 2010
Accumulated Depreciation Amortization And Depletion Expense Property Plant And Equipment Current Charge	$ 115,000,000	$ 132,800,000	$ 152,600,000
Financing Receivable, Recorded Investment, Past Due	0	0
Provision for Loan and Lease Losses	$ 0	$ 0
Weighted Average Warranty For Companys Products In Years	three years
Maximum Warranty For Companys Products (In Years)	ten years or more

The sum of the periodic provision charged to operations, based on an assessment of the uncollectibility of the loan and lease portfolio, the offset to which is either added to or deducted from the allowance account for the purpose of reducing loan receivable and leases to an amount that approximates their net realizable value (the amount expected to be collected).

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