Finance Receivables - Changes In Allowance For Credit Losses On Finance Receivables (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2021	Mar. 29, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 390,936	$ 198,581
Provision for credit losses	(22,474)	79,419
Charge-offs	(34,589)	(55,215)
Recoveries	12,360	12,107
Balance, end of period	346,233	335,496
Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period		100,604
Retail
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	371,738	188,501
Provision for credit losses	(22,449)	70,417
Charge-offs	(34,589)	(55,215)
Recoveries	12,360	12,107
Balance, end of period	327,060	311,368
Retail | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period		95,558
Wholesale
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	19,198	10,080
Provision for credit losses	(25)	9,002
Charge-offs	0	0
Recoveries	0	0
Balance, end of period	$ 19,173	24,128
Wholesale | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period		$ 5,046