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Asset-Backed Financing Schedule of loans acquired in transfer not accounted for as debt securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2015
Jun. 28, 2015
Mar. 29, 2015
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Sep. 27, 2015
Variable Interest Entity [Line Items]              
Document Fiscal Year Focus             2015
Variable Interest Entity, Not Primary Beneficiary [Member] | Foreign Line of Credit [Member] | Asset-Backed Canadian Commercial Paper Conduit Facility [Member]              
Variable Interest Entity [Line Items]              
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition $ 33,100 $ 26,761 $ 19,200 $ 24,400 $ 26,400 $ 15,727  
Line of Credit [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Foreign Line of Credit [Member] | Asset-Backed Canadian Commercial Paper Conduit Facility [Member]              
Variable Interest Entity [Line Items]              
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers $ 29,000 $ 23,416 $ 16,800 $ 21,400 $ 23,100 $ 13,761