Business Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2020 USD ($)	Sep. 29, 2019 USD ($)	Sep. 27, 2020 USD ($) segment	Sep. 29, 2019 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting Information
Selling, administrative and engineering expense	$ 231,721	$ 309,031	$ 734,057	$ 885,273
Restructuring expense	43,915	7,629	85,864	31,682
Motorcycles and Related Products cost of goods sold	676,796	748,878	2,019,310	2,576,342
Operating income	137,884	119,844	129,298	543,213
Motorcycles and Related Products
Segment Reporting Information
Motorcycles revenue	964,029	1,068,942	2,733,091	3,698,583
Gross profit	287,233	320,064	713,781	1,122,241
Selling, administrative and engineering expense	196,912	265,464	618,912	754,479
Restructuring expense	43,581	7,629	84,586	31,682
Operating income	46,740	46,971	10,283	336,080
Financial services
Segment Reporting Information
Restructuring expense	334	0	1,278	0
Financial Services	201,655	203,577	596,064	590,935
Motorcycles and Related Products cost of goods sold	110,177	130,704	475,771	383,802
Operating income	$ 91,144	$ 72,873	$ 119,015	$ 207,133