Restructuring Expense (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		1 Months Ended	9 Months Ended		1 Months Ended	9 Months Ended
	Sep. 29, 2013	Sep. 29, 2013 2011 Restructuring Plan [Member] New Castalloy Faciltiy [Member] employee	Feb. 28, 2011 2011 Restructuring Plan [Member] Kansas City Facility [Member]	Sep. 29, 2013 2011 Restructuring Plan [Member] Kansas City Facility [Member]	Sep. 29, 2013 Original 2011 Restructuring Plan [Member] New Castalloy Faciltiy [Member]	Sep. 30, 2010 2010 Restructuring Plan [Member] agreement	Sep. 29, 2013 2010 Restructuring Plan [Member]	Sep. 29, 2013 2010 Restructuring Plan [Member] Milwaukee Facilities [Member]	Sep. 29, 2013 2010 Restructuring Plan [Member] Tomahawk Facilities [Member]	Sep. 29, 2013 2009 Restructuring Plan [Member]	Sep. 29, 2013 2009 Restructuring Plan [Member] Production [Member] Hourly [Member] Maximum [Member]	Sep. 29, 2013 2009 Restructuring Plan [Member] Motorcycles [Member] Non-Production [Member] Salaried [Member]	Sep. 29, 2013 2009 Restructuring Plan [Member] Financial Services [Member] Non-Production [Member] Salaried [Member]
Restructuring Cost and Reserve [Line Items]
Document Fiscal Year Focus	2013
Estimated reduction in workforce		100		145	200			250	75		2,900	800	100
Restructuring and Related Cost, Expected Number Of Workforce Positions Retained		100
Non-cash charges		35.00%								30.00%
Cost incurred to date		$ 21.0		$ 5.9			$ 59.2			$ 395.3
Labor agreement period (in years)			7 years			7 years
Cost incurred to date, non-cash				10.00%			45.00%
Number of labor agreements						3