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Gain on Insurance Recoveries (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 03, 2011
Feb. 26, 2011
Dec. 03, 2011
Dec. 01, 2012
Insurance recoveries        
Charge for plants lost due to the collapse from snow load   $ 300    
Gain on insurance recoveries 371   571  
Inventory, at cost 13,695   13,695 14,206
Imperial hoop houses
       
Insurance recoveries        
Charge for plants lost due to the collapse from snow load     300  
Gain on insurance recoveries     479  
Proceeds from insurance claim     479  
Imperial inventory impairment
       
Insurance recoveries        
Gain on insurance recoveries     92  
Inventory, at cost 352   352  
Proceeds from insurance claim     $ 444