Business Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 28, 2020 USD ($) segment	Jun. 30, 2019 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting Information
Selling, administrative and engineering expense	$ 224,365	$ 307,617	$ 502,336	$ 576,242
Restructuring expense	41,949	10,423	41,949	24,053
Motorcycles and Related Products cost of goods sold	561,646	979,266	1,342,514	1,827,464
Operating (loss) income	(116,099)	256,257	(8,586)	423,369
Motorcycles and Related Products
Segment Reporting Information
Motorcycles revenue	669,274	1,434,004	1,769,062	2,629,641
Gross profit	107,628	454,738	426,548	802,177
Selling, administrative and engineering expense	187,647	263,587	422,000	489,015
Restructuring expense	41,005	10,423	41,005	24,053
Operating (loss) income	(121,024)	180,728	(36,457)	289,109
Financial services
Segment Reporting Information
Restructuring expense	944	0	944	0
Financial Services	195,953	198,615	394,409	387,358
Motorcycles and Related Products cost of goods sold	190,084	123,086	365,594	253,098
Operating (loss) income	$ 4,925	$ 75,529	$ 27,871	$ 134,260