Quarterly report pursuant to Section 13 or 15(d)

Repurchase of Common Stock (Details)

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Repurchase of Common Stock (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended
Jan. 23, 2013
Dec. 29, 2012
Dec. 01, 2012
Nov. 03, 2012
Dec. 29, 2012
Dec. 31, 2011
Jun. 30, 2012
Equity [Abstract]              
Increase in value of shares authorized to be repurchased $ 10.0            
Authorized amount 30.0           20.0
Shares repurchased (shares)         139,797 49,948  
Aggregated number of shares repurchased (shares)   1,582,298     1,582,298    
Shares repurchased, value         2.0 0.9  
Aggregated shares repurchased, value   17.3     17.3    
Remaining authorized amount   2.7 3.5 4.1 2.7    
Purchases of Common Stock [Abstract]              
Shares of common stock purchased (shares)   55,237 40,807 43,753 139,797    
Average price paid per share (usd per share)   $ 14.08 $ 14.62 $ 14.63 $ 14.41    
Total number of shares purchased as part of publicly announced plans (shares)   55,237 40,807 43,753 139,797    
Dollar value of shares that may yet be purchased under the plans   $ 2.7 $ 3.5 $ 4.1 $ 2.7