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Shareholders' Equity (Details) (USD $)
3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended
Sep. 27, 2013
Sep. 26, 2014
Sep. 27, 2013
Dec. 27, 2013
Mar. 21, 2012
2012 Tender Offer [Member]
Sep. 26, 2013
2013 Tender Offer [Member]
Aug. 28, 2013
2013 Tender Offer [Member]
Sep. 26, 2013
2013 Tender Offer [Member]
Minimum [Member]
Aug. 28, 2013
2013 Tender Offer [Member]
Minimum [Member]
Sep. 26, 2013
2013 Tender Offer [Member]
Maximum [Member]
Aug. 28, 2013
2013 Tender Offer [Member]
Maximum [Member]
Sep. 26, 2014
Stock Repurchase A [Member]
Sep. 26, 2014
Stock Repurchase B [Member]
Oct. 15, 2013
Subsequent Event [Member]
2013 Tender Offer [Member]
Equity, Class of Treasury Stock [Line Items]                            
Stock repurchase authorized           $ 25,000,000 $ 35,750,000             $ 6,900,000
Stock repurchase shares authorized                           1,000,000
Common stock, par value   $ 0.001   $ 0.001     $ 0.001              
Purchase price per share     $ 4.80         $ 6.50 $ 5.75 $ 7.00 $ 6.50 $ 6.13 $ 6.07 $ 7.00
Percentage of issued and outstanding shares repurchased in tender offer         27.00%                 3.10%
Number of stock repurchased in tender offer         11,000,000                  
Price per share repurchased in tender offer         $ 5.00                  
Stock repurchase cost of tender offer net of fees and expenses related to tender offer         55,000,000                  
Repurchase of common stock 0   124,000                 485,000 1,700,000  
Total cost     594,000                 3,000,000 10,300,000  
Amount available under repurchase plan   $ 4,300,000