Product Warranty And Safety Recall Campaigns (Narrative) (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 28, 2015	Dec. 31, 2014	Jun. 29, 2014
Motorcycles [Member]
Product Information [Line Items]
Standard product warranty, period	2 years
Parts and Accessories Finished Goods [Member]
Product Information [Line Items]
Standard product warranty, period	1 year
Japan [Member] | Motorcycles [Member]
Product Information [Line Items]
Standard product warranty, period	3 years
Safety Recall [Member]
Product Information [Line Items]
Liability for safety recall campaigns	$ 16.6	$ 9.8	$ 6.8