Finance Receivables (Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment) (Detail) - USD ($)	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Jun. 25, 2017	Mar. 26, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 184,000		$ 0	$ 0
Collectively evaluated for impairment	193,746,000		192,471,000	193,528,000
Total allowance for credit losses	193,930,000	$ 190,350,000	192,471,000	193,528,000	$ 184,030,000	$ 173,343,000
Individually evaluated for impairment	220,000		0	0
Collectively evaluated for impairment	7,506,912,000		7,157,557,000	7,526,063,000
Financing receivable, gross	7,507,132,000		7,157,557,000	7,526,063,000
Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0		0	0
Collectively evaluated for impairment	187,502,000		186,254,000	185,899,000
Total allowance for credit losses	187,502,000	182,150,000	186,254,000	185,899,000	176,068,000	166,810,000
Individually evaluated for impairment	0		0	0
Collectively evaluated for impairment	6,373,926,000		6,140,600,000	6,267,211,000
Financing receivable, gross	6,373,926,000		6,140,600,000	6,267,211,000
Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	184,000		0	0
Collectively evaluated for impairment	6,244,000		6,217,000	7,629,000
Total allowance for credit losses	6,428,000	$ 8,200,000	6,217,000	7,629,000	$ 7,962,000	$ 6,533,000
Individually evaluated for impairment	220,000		0	0
Collectively evaluated for impairment	1,132,986,000		1,016,957,000	1,258,852,000
Financing receivable, gross	$ 1,133,206,000		$ 1,016,957,000	$ 1,258,852,000