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Cash And Cash Equivalents And Investments (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 3 Months Ended 6 Months Ended
Oct. 21, 2013
Sep. 28, 2013
Jun. 29, 2013
Sep. 29, 2012
Sep. 28, 2013
Sep. 29, 2012
Oct. 28, 2013
Dec. 21, 2012
Cash And Cash Equivalents And Investments [Abstract]                
Unrealized (loss) gain from short-term investments, categorized as trading   $ 427   $ 291 $ 408 $ 194    
Proceeds from Sale and Maturity of Short-Term Available-for-sale securities   13,818   18,837 63,830 44,602    
Available-for-sale Securities, Gross Realized Gain (Loss)   1     153      
ARS, estimated fair value   2,100 1,900   2,100      
ARS redemption at par value 2,100 0 12,950   12,950      
Long Term Note Receivable   300     300     300
Annual interest rate   5.00%     5.00%      
Subsequent Event, Loan To Third Party, Amount             200  
Investment To Be Made If Conversion Feature Fulfilled   $ 1,500     $ 1,500