Asset-Backed Financing (Assets And Liabilities Of Variable Interest Entities) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 28, 2015	Mar. 29, 2015	Jun. 29, 2014	Mar. 30, 2014	Dec. 31, 2014
Financing Receivable [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	$ 2,375,748		$ 2,097,385		$ 1,643,701
Financing Receivable [Member] | Asset-backed Securities [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	2,199,018		1,893,585		1,458,602
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
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	176,730		203,800		185,099
Allowance for Credit Loss [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	(52,057)		(42,564)		(35,121)
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	(49,400)		(39,329)		(32,156)
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
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	(2,657)		(3,235)		(2,965)
Restricted Cash [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	162,211		154,681		122,052
Restricted Cash [Member] | Asset-backed Securities [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	149,418		141,146		110,017
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
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	12,793		13,535		12,035
Other Assets [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	3,407		2,761		3,671
Other Assets [Member] | Asset-backed Securities [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	2,857		2,342		2,987
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	210		179		422
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	340		240		262
Assets, Total [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	2,489,309		2,212,263		1,734,303
Assets, Total [Member] | Asset-backed Securities [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	2,301,893		1,997,744		1,539,450
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	210		179		422
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	187,206		214,340		194,431
Asset-backed debt [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	2,178,019		1,886,079		1,438,445
Asset-backed debt [Member] | Asset-backed Securities [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	2,017,079		1,712,855		1,271,533
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
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	160,940		173,224		$ 166,912
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	26,800	$ 19,200	26,400	$ 15,700
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	$ 23,400	$ 16,800	$ 23,100	$ 13,800