Finance Receivables - Changes In Allowance For Credit Losses On Finance Receivables (Details) - USD ($)	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 198,581,000	$ 189,885,000
Provision for credit losses	79,419,000	34,491,000
Charge-offs	(55,215,000)	(44,721,000)
Recoveries	12,107,000	11,217,000
Balance, end of period	335,496,000	190,872,000
Retail
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	188,501,000	182,098,000
Provision for credit losses	70,417,000	32,832,000
Charge-offs	(55,215,000)	(44,721,000)
Recoveries	12,107,000	11,217,000
Balance, end of period	311,368,000	181,426,000
Wholesale
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	10,080,000	7,787,000
Provision for credit losses	9,002,000	1,659,000
Charge-offs	0	0
Recoveries	0	0
Balance, end of period	$ 24,128,000	$ 9,446,000