Restructuring Expenses Restructuring Expenses (Restructuring Plan Reserve Recorded in Accrued Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jun. 25, 2017	Jul. 01, 2018	Jun. 25, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, reversal of previously recognized expense	$ 1,700
Restructuring Reserve [Roll Forward]
Restructuring expense	12,370	$ 0	$ 59,212	$ 0
Motorcycles and Related Products
Restructuring Reserve [Roll Forward]
Balance, beginning of period	38,350		0
Restructuring expense	12,370		59,212
Utilized - cash	(3,926)		(6,600)
Utilized - non cash	(9,746)		(15,359)
Foreign currency changes	(213)		(418)
Balance, end of period	36,835		36,835
Motorcycles and Related Products | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period	38,287		0
Restructuring expense	(1,186)		39,605
Utilized - cash	(133)		(2,433)
Utilized - non cash	0		0
Foreign currency changes	(210)		(414)
Balance, end of period	36,758		36,758
Motorcycles and Related Products | Project Implementation Costs [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period	63		0
Restructuring expense	3,810		4,248
Utilized - cash	(3,793)		(4,167)
Utilized - non cash	0		0
Foreign currency changes	(3)		(4)
Balance, end of period	77		77
Motorcycles and Related Products | Accelerated Depreciation [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period	0		0
Restructuring expense	9,746		15,359
Utilized - cash	0		0
Utilized - non cash	(9,746)		(15,359)
Foreign currency changes	0		0
Balance, end of period	$ 0		$ 0