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Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended9 Months Ended12 Months Ended
Oct. 02, 2010
Oct. 01, 2011
statement
month
Dec. 31, 2010
Jul. 03, 2010
Significant Accounting Policies    
Increase in retained earnings  $ 2,654$ 2,749
Increase (decrease) in net earnings due to changes made to the provision for income tax expenses$ (867) $ (772) 
Number of continuous statements required to be presented by the entity to reflect the components of other comprehensive income and of net income 1  
Number of separate consecutive statements required to be presented by the entity to reflect the components of other comprehensive income and of net income 2