Asset-Backed Financing (Schedule of Loans Acquired in Transfer Not Accounted For as Debt Securities) (Detail) - Secured Debt - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jul. 01, 2018	Apr. 01, 2018	Jun. 25, 2017	Mar. 26, 2017	Jul. 01, 2018	Jun. 25, 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	$ 59,100	$ 32,900	$ 28,200	$ 333,400	$ 92,000	$ 361,600
Proceeds on finance receivables	53,300	29,300	24,000	300,000	82,600	324,000
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	38,900	7,600	14,200	6,300	46,500	20,500
Proceeds on finance receivables	$ 32,200	$ 6,200	$ 12,400	$ 5,500	$ 38,400	$ 17,900