Finance Receivables (Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment) (Detail) - USD ($)	Mar. 26, 2017	Dec. 31, 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	184,030,000	173,343,000	156,184,000
Total allowance for credit losses	184,030,000	173,343,000	156,184,000	$ 147,178,000
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	7,330,152,000	7,008,801,000	7,532,750,000
Financing receivable, gross	7,330,152,000	7,008,801,000	7,532,750,000
Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	176,068,000	166,810,000	146,727,000
Total allowance for credit losses	176,068,000	166,810,000	146,727,000	139,320,000
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	6,002,550,000	5,982,211,000	6,012,804,000
Financing receivable, gross	6,002,550,000	5,982,211,000	6,012,804,000
Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	7,962,000	6,533,000	9,457,000
Total allowance for credit losses	7,962,000	6,533,000	9,457,000	$ 7,858,000
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	1,327,602,000	1,026,590,000	1,519,946,000
Financing receivable, gross	$ 1,327,602,000	$ 1,026,590,000	$ 1,519,946,000