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Net Income Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 26, 2012
Sep. 26, 2012
Jun. 27, 2012
Mar. 28, 2012
Dec. 28, 2011
Sep. 28, 2011
Jun. 29, 2011
Mar. 30, 2011
Dec. 26, 2012
Dec. 28, 2011
Dec. 29, 2010
Numerator [Abstract]                      
Net income $ 6,480 $ 5,363 $ 4,601 $ 5,865 $ 92,048 $ 7,985 $ 8,130 $ 4,124 $ 22,309 $ 112,287 $ 22,713
Denominator [Abstract]                      
Weighted average shares - basic (in shares)                 94,949 97,646 98,902
Effect of dilutive securities [Abstract]                      
Weighted average shares - diluted (in shares)                 96,754 99,588 101,391
Basic net income per share (US$ per share) $ 0.07 [1] $ 0.06 [1] $ 0.05 [1] $ 0.06 [1] $ 0.96 [2] $ 0.08 [2] $ 0.08 [2] $ 0.04 [2] $ 0.23 $ 1.15 $ 0.23
Diluted net income per share (US$ per share) $ 0.07 [1] $ 0.06 [1] $ 0.05 [1] $ 0.06 [1] $ 0.94 [2] $ 0.08 [2] $ 0.08 [2] $ 0.04 [2] $ 0.23 $ 1.13 $ 0.22
Options [Member]
                      
Effect of dilutive securities [Abstract]                      
Incremental Common Shares Attributable to Share-based Payment Arrangements                 883 942 1,302
Antidilutive securities excluded from computation of Earnings per Share (shares)                 418 [3] 2,150 [3] 2,238 [3]
Restricted stock units and awards [Member]
                      
Effect of dilutive securities [Abstract]                      
Incremental Common Shares Attributable to Share-based Payment Arrangements                 922 1,000 1,187
Antidilutive securities excluded from computation of Earnings per Share (shares)                 330 [3] 735 [3] 450 [3]
[1] Per share amounts do not necessarily sum to the total year amounts due to changes in shares outstanding and rounding
[2] Per share amounts do not necessarily sum to the total year amounts due to changes in shares outstanding and rounding.
[3] Excluded from diluted weighted-average shares outstanding as the impact would be antidilutive.