Finance Receivables (Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment) (Detail) - USD ($)	Jun. 25, 2017	Mar. 26, 2017	Dec. 31, 2016	Jun. 26, 2016	Mar. 27, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 0		$ 0	$ 0
Collectively evaluated for impairment	193,528,000		173,343,000	161,353,000
Total allowance for credit losses	193,528,000	$ 184,030,000	173,343,000	161,353,000	$ 156,184,000	$ 147,178,000
Individually evaluated for impairment	0		0	0
Collectively evaluated for impairment	7,526,063,000		7,008,801,000	7,443,398,000
Financing receivable, gross	7,526,063,000		7,008,801,000	7,443,398,000
Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0		0	0
Collectively evaluated for impairment	185,899,000		166,810,000	152,998,000
Total allowance for credit losses	185,899,000	176,068,000	166,810,000	152,998,000	146,727,000	139,320,000
Individually evaluated for impairment	0		0	0
Collectively evaluated for impairment	6,267,211,000		5,982,211,000	6,020,750,000
Financing receivable, gross	6,267,211,000		5,982,211,000	6,020,750,000
Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0		0	0
Collectively evaluated for impairment	7,629,000		6,533,000	8,355,000
Total allowance for credit losses	7,629,000	$ 7,962,000	6,533,000	8,355,000	$ 9,457,000	$ 7,858,000
Individually evaluated for impairment	0		0	0
Collectively evaluated for impairment	1,258,852,000		1,026,590,000	1,422,648,000
Financing receivable, gross	$ 1,258,852,000		$ 1,026,590,000	$ 1,422,648,000