Business Segments (Details) $ in Thousands	3 Months Ended
	Mar. 28, 2021 USD ($) segment	Mar. 29, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	2
Segment Reporting Information
Selling, administrative and engineering expense	$ 231,844	$ 277,971
Restructuring benefit	(366)	0
Motorcycles and Related Products cost of goods sold	811,622	780,868
Operating income	346,174	107,513
Assets	11,338,988	11,139,947	$ 12,010,601
Motorcycles and Related Products
Segment Reporting Information
Motorcycles revenue	1,232,107	1,099,788
Gross profit	420,485	318,920
Selling, administrative and engineering expense	193,546	234,353
Restructuring benefit	(593)	0
Operating income	227,532	84,567
Financial services
Segment Reporting Information
Restructuring benefit	227	0
Financial Services	190,400	198,456
Motorcycles and Related Products cost of goods sold	71,531	175,510
Operating income	118,642	22,946
Motorcycles And Related Products Operations
Segment Reporting Information
Assets	2,400,000	2,500,000	2,500,000
Financial Services Operations
Segment Reporting Information
Assets	$ 8,900,000	$ 8,600,000	$ 9,500,000