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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 29, 2015
Jul. 03, 2015
Jun. 27, 2014
Jul. 03, 2015
Jun. 27, 2014
Equity, Class of Treasury Stock [Line Items]          
Purchase price per share     $ 6.03   $ 6.04
Repurchase of common stock     491   1,200
Total cost     $ 3.0   $ 7.3
Amount available under repurchase plan   $ 2.3   $ 2.3  
Dividend paid, per share $ 0.10        
Dividend paid, cash value $ 3.1        
Stock Repurchase A [Member]          
Equity, Class of Treasury Stock [Line Items]          
Purchase price per share   $ 9.51   $ 9.10  
Repurchase of common stock   74   149  
Total cost   $ 0.7   $ 1.4