Finance Receivables (Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment) (Detail) - USD ($)	Sep. 25, 2016	Mar. 27, 2016	Dec. 31, 2015	Sep. 27, 2015	Mar. 29, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 0		$ 0	$ 0
Collectively evaluated for impairment	171,516,000		147,178,000	145,383,000
Total allowance for credit losses	171,516,000	$ 161,353,000	147,178,000	145,383,000	$ 139,231,000	$ 127,364,000
Individually evaluated for impairment	0		0	0
Collectively evaluated for impairment	7,321,482,000		7,015,331,000	7,223,729,000
Financing receivable, gross	7,321,482,000		7,015,331,000	7,223,729,000
Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0		0	0
Collectively evaluated for impairment	164,761,000		139,320,000	139,131,000
Total allowance for credit losses	164,761,000	152,998,000	139,320,000	139,131,000	131,903,000	122,025,000
Individually evaluated for impairment	0		0	0
Collectively evaluated for impairment	6,165,999,000		5,991,471,000	6,194,332,000
Financing receivable, gross	6,165,999,000		5,991,471,000	6,194,332,000
Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0		0	0
Collectively evaluated for impairment	6,755,000		7,858,000	6,252,000
Total allowance for credit losses	6,755,000	$ 8,355,000	7,858,000	6,252,000	$ 7,328,000	$ 5,339,000
Individually evaluated for impairment	0		0	0
Collectively evaluated for impairment	1,155,483,000		1,023,860,000	1,029,397,000
Financing receivable, gross	$ 1,155,483,000		$ 1,023,860,000	$ 1,029,397,000