Restructuring Expenses Restructuring Expenses (Restructuring Plan Reserve Recorded in Accrued Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Mar. 26, 2017
Restructuring Reserve [Roll Forward]
Restructuring expense	$ (46,842)	$ 0
Motorcycles and Related Products
Restructuring Reserve [Roll Forward]
Balance, beginning of period	0
Restructuring expense	(46,842)
Utilized - cash	2,674
Utilized - non cash	5,613
Foreign currency changes	205
Balance, end of period	(38,350)
Motorcycles and Related Products | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period	0
Restructuring expense	(40,791)
Utilized - cash	2,300
Utilized - non cash	0
Foreign currency changes	204
Balance, end of period	(38,287)
Motorcycles and Related Products | Project Implementation Costs [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period	0
Restructuring expense	(438)
Utilized - cash	374
Utilized - non cash	0
Foreign currency changes	1
Balance, end of period	(63)
Motorcycles and Related Products | Accelerated Depreciation [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period	0
Restructuring expense	(5,613)
Utilized - cash	0
Utilized - non cash	5,613
Foreign currency changes	0
Balance, end of period	$ 0