Goodwill and Acquired Intangible Assets (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 01, 2012	Dec. 03, 2011	Nov. 27, 2010
Actual amortization expense for the years ended: [Line Items]
Amortization	$ 5,890	$ 5,609	$ 4,802

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=6943989&loc=d3e3602-108585

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