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Shareholders' Equity (Details) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended
Jun. 27, 2014
Jun. 28, 2013
Jun. 27, 2014
Jun. 28, 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]
Jun. 27, 2014
Stock Repurchase A [Member]
Jun. 27, 2014
Stock Repurchase B [Member]
Oct. 15, 2013
Subsequent Event [Member]
2013 Tender Offer [Member]
Equity, Class of Treasury Stock [Line Items]                              
Additional stock repurchase authorized $ 5,000,000                            
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   $ 4.80         $ 6.50 $ 5.75 $ 7.00 $ 6.50 $ 6.03 $ 6.04 $ 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   124,000   124,000                 491,000 1,200,000  
Total cost   594,000   594,000                 3,000,000 7,300,000  
Amount available under repurchase plan     $ 2,300,000