Asset-Backed Financing (Schedule of Loans Acquired in Transfer Not Accounted For as Debt Securities) (Detail) - Secured Debt - Variable Interest Entity, Not Primary Beneficiary - Asset-backed Canadian commercial paper conduit facility - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 24, 2017	Jun. 25, 2017	Mar. 26, 2017	Sep. 25, 2016	Jun. 26, 2016	Mar. 27, 2016	Sep. 24, 2017	Sep. 25, 2016
Variable Interest Entity [Line Items]
Transfers on finance receivables	$ 0	$ 14,200	$ 6,300	$ 0	$ 31,400	$ 6,600	$ 20,500	$ 38,000
Foreign Line of Credit
Variable Interest Entity [Line Items]
Proceeds on finance receivables	$ 0	$ 12,400	$ 5,500	$ 0	$ 27,500	$ 5,800	$ 17,900	$ 33,300