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Business Combinations (Schedule Of Amortization Expense Of Purchased And Other Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 02, 2015
Jan. 03, 2014
Dec. 28, 2012
Acquired Finite-Lived Intangible Assets [Line Items]      
Cost of sales $ 82,913us-gaap_CostOfGoodsSoldAmortization $ 81,119us-gaap_CostOfGoodsSoldAmortization $ 60,277us-gaap_CostOfGoodsSoldAmortization
Operating expenses 75,599trmb_OperatingExpensesAmortizationofPurchasedIntangibleAssets 81,722trmb_OperatingExpensesAmortizationofPurchasedIntangibleAssets 65,430trmb_OperatingExpensesAmortizationofPurchasedIntangibleAssets
Amortization of purchased intangible assets $ 158,512us-gaap_AmortizationOfIntangibleAssets $ 162,841us-gaap_AmortizationOfIntangibleAssets $ 125,707us-gaap_AmortizationOfIntangibleAssets