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Investments (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended
Dec. 01, 2012
Dec. 03, 2011
Nov. 27, 2010
Jan. 18, 2013
SNHC
Mar. 03, 2012
SNHC
Dec. 01, 2012
SNHC
Dec. 03, 2011
SNHC
Investments              
Interest and dividend income from investments $ 606 $ 217 $ 300        
Income (loss) on equity investments 7 (7) 2        
Total investment income 613 210 302        
Investment in Centaur Media              
Dividend income 188 169 227        
Fair value 4,226 3,005          
Cost 2,677 2,677          
Unrealized gain 1,549 328          
Investments              
Equity interest in cost method investment (as a percent)           14.00%  
Cash distribution received         693    
Carrying value of investment             309
Payment received as return of investment 309         309  
Distribution payment received accounted for as investment income           384  
Initial cash proceeds from sale of investment       $ 3,226