Finance Receivables (Aging Of Past Due Finance Receivables Including Non Accrual Status Finance Receivables) (Detail) - USD ($) $ in Thousands	Jul. 01, 2018	Dec. 31, 2017	Jun. 25, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 175,754	$ 228,084	$ 182,170
Total finance receivables	7,507,132	7,157,557	7,526,063
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, current	7,331,378	6,929,473	7,343,893
31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	117,344	140,224	118,897
61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	35,897	47,784	37,056
Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	22,513	40,076	26,217
Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	175,020	227,127	180,619
Total finance receivables	6,373,926	6,140,600	6,267,211
Retail | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, current	6,198,906	5,913,473	6,086,592
Retail | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	116,828	139,629	118,616
Retail | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	35,763	47,539	36,914
Retail | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	22,429	39,959	25,089
Wholesale
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	734	957	1,551
Total finance receivables	1,133,206	1,016,957	1,258,852
Wholesale | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, current	1,132,472	1,016,000	1,257,301
Wholesale | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	516	595	281
Wholesale | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	134	245	142
Wholesale | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 84	$ 117	$ 1,128