Finance Receivables - Changes In Allowance For Credit Losses On Finance Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 346,233	$ 335,496	$ 390,936	$ 198,581
Provision for credit losses	16,201	91,179	(6,273)	170,598
Charge-offs	(17,107)	(29,859)	(51,696)	(85,074)
Recoveries	13,484	14,199	25,844	26,306
Balance, end of period	358,811	411,015	358,811	411,015
Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period		0		100,604
Retail
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	327,060	311,368	371,738	188,501
Provision for credit losses	19,053	94,050	(3,396)	164,467
Charge-offs	(17,107)	(29,859)	(51,696)	(85,074)
Recoveries	13,484	14,199	25,844	26,306
Balance, end of period	342,490	389,758	342,490	389,758
Retail | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period		0		95,558
Wholesale
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	19,173	24,128	19,198	10,080
Provision for credit losses	(2,852)	(2,871)	(2,877)	6,131
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance, end of period	$ 16,321	21,257	$ 16,321	21,257
Wholesale | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period		$ 0		$ 5,046