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Dividends (Details) (USD $)
0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended
Dec. 31, 2012
Class A Common Stock [Member]
Jun. 28, 2014
Class A Common Stock [Member]
Jun. 29, 2013
Class A Common Stock [Member]
Jun. 28, 2014
Class A Common Stock [Member]
Jun. 29, 2013
Class A Common Stock [Member]
Dec. 31, 2012
Class B Common Stock [Member]
Jun. 28, 2014
Class B Common Stock [Member]
Jun. 29, 2013
Class B Common Stock [Member]
Jun. 28, 2014
Class B Common Stock [Member]
Jun. 29, 2013
Class B Common Stock [Member]
Jun. 28, 2014
Dividend 1 [Member]
Oct. 24, 2013
Dividend 1 [Member]
Class A Common Stock [Member]
Oct. 24, 2013
Dividend 1 [Member]
Class B Common Stock [Member]
Jun. 28, 2014
Dividend 2 [Member]
Jan. 23, 2014
Dividend 2 [Member]
Class A Common Stock [Member]
Jan. 23, 2014
Dividend 2 [Member]
Class B Common Stock [Member]
Jun. 28, 2014
Dividend 3 [Member]
Apr. 24, 2014
Dividend 3 [Member]
Class A Common Stock [Member]
Apr. 24, 2014
Dividend 3 [Member]
Class B Common Stock [Member]
Dec. 31, 2012
Special Dividend [Member]
Jun. 28, 2014
Special Dividend [Member]
Dec. 07, 2012
Special Dividend [Member]
Class A Common Stock [Member]
Dec. 07, 2012
Special Dividend [Member]
Class B Common Stock [Member]
Dividends Payable [Line Items]                                              
Cash dividends per share of common stock                                           $ 0.66 $ 0.60
Cash dividends per share of common stock $ 0.165 $ 0.165 $ 0.165 $ 0.495 $ 1.155 $ 0.15 $ 0.150 $ 0.150 $ 0.450 $ 1.050   $ 0.165 $ 0.15   $ 0.165 $ 0.15   $ 0.165 $ 0.15        
Dividend payment date                     Oct. 24, 2013     Jan. 23, 2014     Apr. 24, 2014     Dec. 31, 2012 Dec. 31, 2012    
Dividend record date                     Oct. 10, 2013     Jan. 09, 2014     Apr. 10, 2014     Dec. 21, 2012 Dec. 21, 2012