Asset-Backed Financing (Schedule of Loans Acquired in Transfer Not Accounted For as Debt Securities) (Detail) - Secured Debt - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Mar. 26, 2017
SPEs | Asset-Backed U.S. Commercial Paper Conduit Facility VIE [Member] | U.S. Line of Credit
Variable Interest Entity [Line Items]
Transfers on finance receivables	$ 32,900	$ 333,400
Proceeds on finance receivables	29,300	300,000
Variable Interest Entity, Not Primary Beneficiary | Asset-backed Canadian commercial paper conduit facility | Foreign Line of Credit
Variable Interest Entity [Line Items]
Transfers on finance receivables	7,600	6,300
Proceeds on finance receivables	$ 6,200	$ 5,500