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Contingencies (Details 1) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 12 Months Ended 41 Months Ended
Dec. 29, 2010
TransWeb [Member]
Sep. 24, 2013
TransWeb [Member]
Dec. 01, 2012
TransWeb [Member]
May 31, 2014
TransWeb [Member]
Dec. 29, 2010
TransWeb [Member]
Business Acquisition, Purchase Price Withheld Disclosures [Line Items]          
Litigation settlement     $ 34    
Gain contingency not yet recognized   26,147      
Purchase price excluding cash acquired 30,017        
Business acquisition, purchase price withheld         17,000
Business acquisition, legal charges applied against purchase price withheld       $ 17,000