Business Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2021 USD ($)	Sep. 27, 2020 USD ($)	Sep. 26, 2021 USD ($) segment	Sep. 27, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting Information
Selling, administrative and engineering expense	$ 254,312	$ 231,721	$ 747,665	$ 734,057
Restructuring expense	615	43,915	1,167	85,864
Motorcycles and Related Products cost of goods sold	850,193	676,796	2,586,264	2,019,310
Operating income	204,212	137,884	830,746	129,298
Assets	11,199,804	12,532,275	11,199,804	12,532,275	$ 12,010,601
Motorcycles and Related Products
Segment Reporting Information
Motorcycles revenue	1,160,618	964,029	3,724,225	2,733,091
Gross profit	310,425	287,233	1,137,961	713,781
Selling, administrative and engineering expense	212,243	196,912	626,211	618,912
Restructuring expense	517	43,581	731	84,586
Operating income	97,665	46,740	511,019	10,283
Financial Services
Segment Reporting Information
Restructuring expense	98	334	436	1,278
Financial Services	204,692	201,655	595,650	596,064
Motorcycles and Related Products cost of goods sold	98,047	110,177	275,487	475,771
Operating income	106,547	91,144	319,727	119,015
Motorcycles And Related Products Operations
Segment Reporting Information
Assets	3,000,000	2,400,000	3,000,000	2,400,000	2,500,000
Financial Services Operations
Segment Reporting Information
Assets	$ 8,200,000	$ 10,100,000	$ 8,200,000	$ 10,100,000	$ 9,500,000