Restructuring Expense (Narrative) (Detail) (USD $)	1 Months Ended	6 Months Ended
	Feb. 28, 2011	Jul. 01, 2012 2011 Restructuring Plan [Member]	Jul. 01, 2012 2011 Restructuring Plan [Member] Kansas City Facility [Member]	Jun. 26, 2011 2011 Restructuring Plan [Member] Kansas City Facility [Member]	Jul. 01, 2012 2010 Restructuring Plan [Member]	Jul. 01, 2012 2010 Restructuring Plan [Member] Milwaukee Facilities [Member]	Jul. 01, 2012 2010 Restructuring Plan [Member] Tomahawk Facilities [Member]	Jul. 01, 2012 2011 Kansas City Restructuring Plan [Member]	Jul. 01, 2012 2011 New Castalloy Restructuring Plan [Member] Employee	Jul. 01, 2012 2009 Restructuring Plan [Member]	Jun. 26, 2011 2009 Restructuring Plan [Member]	Jul. 01, 2012 2009 Restructuring Plan [Member] Motorcycles [Member]	Jul. 01, 2012 2009 Restructuring Plan [Member] Financial Services [Member]
Restructuring Cost and Reserve [Line Items]
Estimated reduction in workforce									200
Estimated restructuring expense		$ 14,000,000			$ 62,000,000				$ 30,000,000
Non-cash restructuring expense				200,000					30,000,000		253,000
Estimated percentage of restructuring charges that will be non-cash		10.00%			42.00%				35.00%	30.00%
Cumulative restructuring and impairment expenses					60,400,000			7,800,000	15,400,000	389,800,000
Incurred restructuring and impairment expense					3,500,000				6,000,000	9,200,000
Labor agreement period (in years)	7
Less employees: required under existing contract			145			250	75
Reduction in hourly production positions, minimum										2,700
Reduction in hourly production positions, maximum										2,900
Estimated reduction in salaried positions from restructuring												720	100
Restructuring and impairment expenses, minimum										384,000,000
Restructuring and impairment expenses, maximum										$ 404,000,000