Finance Receivables (Recorded Investment Of Retail and Wholesale Finance Receivables By Credit Quality Indicator) (Detail) - USD ($) $ in Thousands	Apr. 01, 2018	Dec. 31, 2017	Mar. 26, 2017
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	$ 7,316,792	$ 7,157,557	$ 7,330,152
Retail
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	6,064,192	6,140,600	6,002,550
Retail | Prime
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	4,923,237	4,966,193	4,806,730
Retail | Sub-prime
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	1,140,955	1,174,407	1,195,820
Wholesale
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	1,252,600	1,016,957	1,327,602
Wholesale | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	1,582	688	1,133
Wholesale | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	3,368	3,837	9,213
Wholesale | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	33,085	26,866	19,898
Wholesale | Medium Risk
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	10,512	9,917	14,648
Wholesale | Low Risk
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, gross	$ 1,204,053	$ 975,649	$ 1,282,710