Asset-Backed Financing (Assets And Liabilities Of Variable Interest Entities) (Detail) - USD ($)	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	Dec. 31, 2014
Variable Interest Entity [Line Items]
Document Fiscal Year Focus							2015
Financing Receivable [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	$ 2,050,744,000			$ 1,855,485,000			$ 2,050,744,000	$ 1,643,701,000
Financing Receivable [Member] | Asset-backed Securities [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	1,875,571,000			1,651,552,000			1,875,571,000	1,458,602,000
Financing Receivable [Member] | Asset-backed U.S. Commercial Paper Conduit Facility [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	0			0			0	0
Financing Receivable [Member] | Asset-Backed Canadian Commercial Paper Conduit Facility [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	175,173,000			203,933,000			175,173,000	185,099,000
Allowance for Credit Loss [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	(45,769,000)			(38,374,000)			(45,769,000)	(35,121,000)
Allowance for Credit Loss [Member] | Asset-backed Securities [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	(42,679,000)			(35,115,000)			(42,679,000)	(32,156,000)
Allowance for Credit Loss [Member] | Asset-backed U.S. Commercial Paper Conduit Facility [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	0			0			0	0
Allowance for Credit Loss [Member] | Asset-Backed Canadian Commercial Paper Conduit Facility [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	(3,090,000)			(3,259,000)			(3,090,000)	(2,965,000)
Restricted Cash [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	137,217,000			142,286,000			137,217,000	122,052,000
Restricted Cash [Member] | Asset-backed Securities [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	125,561,000			129,828,000			125,561,000	110,017,000
Restricted Cash [Member] | Asset-backed U.S. Commercial Paper Conduit Facility [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	0			0			0	0
Restricted Cash [Member] | Asset-Backed Canadian Commercial Paper Conduit Facility [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	11,656,000			12,458,000			11,656,000	12,035,000
Other Assets [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	4,965,000			4,058,000			4,965,000	3,671,000
Other Assets [Member] | Asset-backed Securities [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	4,383,000			3,313,000			4,383,000	2,987,000
Other Assets [Member] | Asset-backed U.S. Commercial Paper Conduit Facility [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	109,000			532,000			109,000	422,000
Other Assets [Member] | Asset-Backed Canadian Commercial Paper Conduit Facility [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	473,000			213,000			473,000	262,000
Assets, Total [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	2,147,157,000			1,963,455,000			2,147,157,000	1,734,303,000
Assets, Total [Member] | Asset-backed Securities [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	1,962,836,000			1,749,578,000			1,962,836,000	1,539,450,000
Assets, Total [Member] | Asset-backed U.S. Commercial Paper Conduit Facility [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	109,000			532,000			109,000	422,000
Assets, Total [Member] | Asset-Backed Canadian Commercial Paper Conduit Facility [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	184,212,000			213,345,000			184,212,000	194,431,000
Asset-backed debt [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	1,865,143,000			1,640,314,000			1,865,143,000	1,438,445,000
Asset-backed debt [Member] | Asset-backed Securities [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	1,706,431,000			1,475,148,000			1,706,431,000	1,271,533,000
Asset-backed debt [Member] | Asset-backed U.S. Commercial Paper Conduit Facility [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	0			0			0	0
Asset-backed debt [Member] | Asset-Backed Canadian Commercial Paper Conduit Facility [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	158,712,000			165,166,000			158,712,000	$ 166,912,000
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]
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