Contingencies (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 03, 2011	Dec. 29, 2010
TransWeb [Member]
Business Acquisition, Purchase Price Withheld Disclosures [Line Items]
Business Acquisition, Effective Date of Acquisition	12/29/2010
Business Acquisition, Purchase Price Withheld		$ 17,000
Business Acquisition, Legal Charges Paid and Applied Against Purchase Price Withheld	6,329
Business Acquisition, Purchase Price Withheld Remaining Balance	10,671
TransWeb [Member] | Purchase Price Withheld Remaining Current [Member]
Business Acquisition, Purchase Price Withheld Disclosures [Line Items]
Business Acquisition, Purchase Price Withheld Remaining Balance	6,149
TransWeb [Member] | Purchase Price Withheld Remaining Non-Current [Member]
Business Acquisition, Purchase Price Withheld Disclosures [Line Items]
Business Acquisition, Purchase Price Withheld Remaining Balance	4,522
Legal Contingnecy - Donaldson [Member]
Loss Contingency [Abstract]
Loss Contingency, Damages Sought	3,000
Legal Contingency - Antitrust [Member]
Loss Contingency [Abstract]
Litigation Settlement, Accrued	$ 625