Restructuring Activities - Restructuring Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Restructuring Cost and Reserve
Restructuring expense	$ 43,915	$ 7,629	$ 85,864	$ 31,682
Motorcycles and Related Products
Restructuring Cost and Reserve
Restructuring expense	43,581	7,629	84,586	31,682
Financial services
Restructuring Cost and Reserve
Restructuring expense	334	$ 0	1,278	$ 0
2020 Restructuring Activities
Restructuring Cost and Reserve
Restructuring expense	43,900		85,900
2020 Restructuring Activities | Motorcycles and Related Products
Restructuring Cost and Reserve
Restructuring expense	43,600		84,600
2020 Restructuring Activities | Financial services
Restructuring Cost and Reserve
Restructuring expense	$ 300		$ 1,300