Business Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2021 USD ($)	Jun. 28, 2020 USD ($)	Jun. 27, 2021 USD ($) segment	Jun. 28, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting Information
Selling, administrative and engineering expense	$ 261,509	$ 224,365	$ 493,353	$ 502,336
Restructuring expense	918	41,949	552	41,949
Motorcycles and Related Products cost of goods sold	924,449	561,646	1,736,071	1,342,514
Operating income (loss)	280,360	(116,099)	626,534	(8,586)
Assets	10,909,226	13,156,152	10,909,226	13,156,152	$ 12,010,601
Motorcycles and Related Products
Segment Reporting Information
Motorcycles revenue	1,331,500	669,274	2,563,607	1,769,062
Gross profit	407,051	107,628	827,536	426,548
Selling, administrative and engineering expense	220,422	187,647	413,968	422,000
Restructuring expense	807	41,005	214	41,005
Operating income (loss)	185,822	(121,024)	413,354	(36,457)
Financial Services
Segment Reporting Information
Restructuring expense	111	944	338	944
Financial Services	200,558	195,953	390,958	394,409
Motorcycles and Related Products cost of goods sold	105,909	190,084	177,440	365,594
Operating income (loss)	94,538	4,925	213,180	27,871
Motorcycles And Related Products Operations
Segment Reporting Information
Assets	2,800,000	2,300,000	2,800,000	2,300,000	2,500,000
Financial Services Operations
Segment Reporting Information
Assets	$ 8,200,000	$ 10,800,000	$ 8,200,000	$ 10,800,000	$ 9,500,000