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Consolidated Statement of Shareholders' Equity and Comprehensive Income (Parenthetical) (USD $)
In Thousands
6 Months Ended
Jul. 03, 2011
Comprehensive income:  
Tax effect of unrealized loss on available-for-sale investments $ 35
Tax effect of foreign currency translation adjustment 469
Accumulated Other Comprehensive Gain (Loss) [Member]
 
Comprehensive income:  
Tax effect of unrealized loss on available-for-sale investments 35
Tax effect of foreign currency translation adjustment 469
Comprehensive Income [Member]
 
Comprehensive income:  
Tax effect of unrealized loss on available-for-sale investments 35
Tax effect of foreign currency translation adjustment $ 469