Finance Receivables - Changes In Allowance For Credit Losses On Finance Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 194,996	$ 193,930	$ 189,885	$ 192,471
Provision for credit losses	33,747	23,530	94,621	72,462
Charge-offs	(41,076)	(33,697)	(121,538)	(107,725)
Recoveries	10,909	9,684	35,608	36,239
Balance, end of period	198,576	193,447	198,576	193,447
Retail
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	186,722	187,502	182,098	186,254
Provision for credit losses	35,071	23,629	95,458	72,350
Charge-offs	(41,076)	(33,689)	(121,538)	(107,717)
Recoveries	10,909	9,684	35,608	36,239
Balance, end of period	191,626	187,126	191,626	187,126
Wholesale
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	8,274	6,428	7,787	6,217
Provision for credit losses	(1,324)	(99)	(837)	112
Charge-offs	0	(8)	0	(8)
Recoveries	0	0	0	0
Balance, end of period	$ 6,950	$ 6,321	$ 6,950	$ 6,321