Acquired Intangible Assets and Goodwill (Details Textual) - USD ($) $ in Millions	12 Months Ended
Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Goodwill [Line Items]
Amortization, Total	$ 2.9	$ 2.6	$ 2.4

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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