Note 8. Fair Value Measurement (Detail) - Financial Assets and Liabilities Categorized Based Upon the Fair Value Hierarchy (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 25, 2011
Financial assets $ 24,240 $ 26,155
Financial liabilities 2,076 1,443
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
    
Financial assets 9,180 1,172
Money Market Funds [Member]
    
Financial assets 9,180 [1] 1,172 [2]
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]
    
Financial assets 14,980 24,963
Commercial Paper [Member]
    
Financial assets 14,980 [1] 24,963 [2]
Foreign Currency Forward Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
    
Financial assets 80 20
Financial liabilities 1,298  
Foreign Currency Forward Contracts [Member]
    
Financial assets 80 20
Financial liabilities 1,298  
Interest Rate Swaps [Member] | Fair Value, Inputs, Level 2 [Member]
    
Financial liabilities 778 1,443
Interest Rate Swaps [Member]
    
Financial liabilities 778 1,443
Fair Value, Inputs, Level 1 [Member]
    
Financial assets 9,180 1,172
Fair Value, Inputs, Level 2 [Member]
    
Financial assets 15,060 24,983
Financial liabilities $ 2,076 $ 1,443
[1] Total cash and cash equivalents, short-term investments of $328.1 million as of September 30, 2012 includes cash of $303.9 million held in operating accounts, $9.2 million in money market funds and $15.0 million in commercial paper.
[2] Total short-term investments, cash and cash equivalents of $262.7 million as of December 25, 2011 includes cash of $236.5 million held in operating accounts, $1.2 million in money market funds and $25.0 million in commercial paper.