Basis of Presentation Basis of Presentation (Narrative) (Details)	Oct. 26, 2016
Subsequent event [Member]
Subsequent event
Subsequent event, description	On October 26, 2016, the Company announced it had entered a definitive agreement to purchase substantially all of the assets of Bond Auto Parts, which is a privately held automotive parts chain in New England. The purchase is expected to be completed before the end of the year.

Describes the event or transaction that occurred between the balance sheet date and the date the financial statements are issued or available to be issued.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration