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Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
D
Y
week
Jan. 01, 2011
week
Jan. 02, 2010
week
Basis of Presentation and Principles of Consolidation      
Number of weeks in fiscal year, low end of the range 52    
Number of weeks in fiscal year, high end of the range 53    
Number of weeks in fiscal year 52 52 52
Cash and Cash Equivalents      
Maximum original maturity period of cash and cash equivalents (in days) 90    
Investments      
Threshold original maturity period for available-for-sale or trading securities (in days) 90    
Threshold original maturity period for classification as short-term only with ability and intent to liquidate (in years) 1    
Property and Equipment      
Useful life of property and equipment, low end of range (in years) 3    
Useful life of property and equipment, high end of range (in years) 5    
Long-Lived Assets      
Useful live of purchased intangible assets, low end of range (in years) 2    
Useful live of purchased intangible assets, high end of range (in years) 12    
Advertising      
Advertising expenses $ 1.6 $ 1.4 $ 1.5
Income Taxes      
Threshold likelihood of realization to recognize uncertain tax benefits (as a percent) 50.00%