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Segment Information (Details Textual) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 02, 2013
Reportable_Segment
Customer
Dec. 01, 2012
Reportable_Segment
Mar. 02, 2013
Reportable_Segment
Customer
Mar. 03, 2012
Feb. 26, 2011
Segment Reporting Information [Line Items]          
Number of reportable segments 4 2      
Number of operating segments     3    
Export net sales     $ 63,500,000 $ 75,700,000 $ 79,400,000
Number of customers that account for 10% or more of consolidated net sales 0   0    
Marketable securities 38,800,000   38,800,000    
Corporate and other
         
Segment Reporting Information [Line Items]          
Marketable securities 38,800,000   38,800,000 19,600,000  
Corporate
         
Segment Reporting Information [Line Items]          
Restricted investments $ 26,400,000   $ 26,400,000 $ 23,100,000  
Geographic Concentration Risk | Net export sales
         
Segment Reporting Information [Line Items]          
Export net sales as a percentage of consolidated net sales (percentage)     9.00% 11.00% 14.00%