Subsequent Event Subsequent Event (Details) - Subsequent Event [Member] $ in Millions	1 Months Ended
Oct. 31, 2018 USD ($) Motorcycles
Subsequent Event
Number of Motorcycles Recalled \| Motorcycles	238,300
Inventory Recall Expense \| $	$ 35

Reflects the amount charged against earnings comprised of the costs to announce and effect a recall of defective merchandise.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Name:	us-gaap_InventoryRecallExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration