Annual report pursuant to Section 13 and 15(d)

Dividends to Shareholders (Details)

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Dividends to Shareholders (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 29, 2012
Sep. 29, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Oct. 01, 2011
Jul. 02, 2011
Apr. 02, 2011
Jan. 01, 2011
Oct. 02, 2010
Jul. 03, 2010
Apr. 03, 2010
Dec. 29, 2012
Dec. 31, 2011
Jan. 01, 2011
Summary of regular quarterly dividends to shareholders                              
Declared quarterly dividend $ 0.090 $ 0.090 $ 0.090 $ 0.090 $ 0.090 $ 0.090 $ 0.090 $ 0.060 $ 0.060 $ 0.060 $ 0.060 $ 0.060 $ 1.480 $ 0.403 $ 0.573