Asset-Backed Financing (Narrative) (Detail)	3 Months Ended						9 Months Ended
	Sep. 27, 2015 USD ($)	Jun. 28, 2015 USD ($)	Mar. 29, 2015 USD ($)	Sep. 28, 2014 USD ($)	Jun. 29, 2014 USD ($)	Mar. 30, 2014 USD ($)	Sep. 27, 2015 USD ($)	Jun. 29, 2015 CAD	Dec. 31, 2014 USD ($)
Secured Notes Through One Term Asset-backed Securitization Transaction [Member] | Secured Debt [Member]
Variable Interest Entity [Line Items]
Company issued secured notes	$ 0	$ 500,000,000	$ 700,000,000.0	$ 0	$ 850,000,000	$ 0	$ 0
Asset-Backed Canadian Commercial Paper Conduit Facility [Member] | Foreign Line of Credit [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Line of Credit Facility, Current Borrowing Capacity | CAD								CAD 240,000,000
Debt Instrument, Term							5 years
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	25,500,000						$ 25,500,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	33,100,000	26,761,000	19,200,000	24,400,000	26,400,000	15,727,000
Line of Credit [Member] | Asset-Backed Canadian Commercial Paper Conduit Facility [Member] | Foreign Line of Credit [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers	29,000,000	$ 23,416,000	$ 16,800,000	21,400,000	$ 23,100,000	$ 13,761,000
Third-party Bank [Member] | Line of Credit [Member] | Asset-Backed U.S. Commercial Paper Conduit Facility VIE [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Line of Credit Facility, Current Borrowing Capacity	600,000,000						600,000,000
Borrowings outstanding under conduit facility	$ 0			$ 0			$ 0		$ 0