Finance Receivables (Aging Of Past Due Finance Receivables Including Non Accrual Status Finance Receivables) (Detail) - USD ($) $ in Thousands	Apr. 01, 2018	Dec. 31, 2017	Mar. 26, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 171,985	$ 228,084	$ 164,413
Total finance receivables	7,316,792	7,157,557	7,330,152
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, current	7,144,807	6,929,473	7,165,739
31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	105,915	140,224	101,600
61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	37,980	47,784	33,676
Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	28,090	40,076	29,137
Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	166,560	227,127	162,386
Total finance receivables	6,064,192	6,140,600	6,002,550
Retail | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, current	5,897,632	5,913,473	5,840,164
Retail | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	105,366	139,629	100,471
Retail | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	33,275	47,539	33,403
Retail | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	27,919	39,959	28,512
Wholesale
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,425	957	2,027
Total finance receivables	1,252,600	1,016,957	1,327,602
Wholesale | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, current	1,247,175	1,016,000	1,325,575
Wholesale | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	549	595	1,129
Wholesale | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,705	245	273
Wholesale | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 171	$ 117	$ 625