Litigation And Contingent Liabilities (Details) - dealer		12 Months Ended
Feb. 01, 2013	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Number of dealers alleging damages	6	5
Loss Contingency, Claims Dismissed, Number		1

Number of plaintiffs that have filed claims pertaining to a loss contingency.

No definition available.

Name:	us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration