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Shareholders' Equity (Details) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended | 144 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 28, 2012 | Feb. 26, 2004 | Sep. 26, 2013 | Aug. 28, 2013 | Jul. 30, 2002 | Dec. 27, 2013 | Dec. 28, 2012 | Dec. 30, 2011 | Dec. 28, 2013 | Oct. 15, 2013 | Mar. 21, 2012
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase authorized |  |  | $ 25,000,000 | $ 35,750,000 | $ 5,000,000 | $ 85,000,000 |  |  |  |  |
Common stock, par value | $ 0.001 |  |  |  |  | $ 0.001 | $ 0.001 |  |  |  |
Price per share repurchased in tender offer |  |  |  |  |  |  |  |  |  | $ 7.00 | $ 5.00
Stock repurchase cost of tender offer net of fees and expenses related to tender offer | 55,587,000 |  |  |  |  | 7,170,000 | 55,587,000 |  |  | 6,900,000 | 55,000,000
Percentage of issued and outstanding shares repurchased in tender offer |  |  |  |  |  |  |  |  |  | 3.00% | 27.00%
Number of stock repurchased in tender offer |  |  |  |  |  |  |  |  |  | 1,000,000 | 11,000,000
Percentage of eligble compensation allowed, per grant purchase |  |  |  |  |  | 10.00% |  |  |  |  |
Interval between employee stock purchases |  |  |  |  |  | 6 months |  |  |  |  |
Employee purchase price as percentage of trading value |  |  |  |  |  | 95.00% |  |  |  |  |
Annual share repurchase authorized, value |  |  |  |  |  | 25,000 |  |  |  |  |
Employee stock purchase plan, expiration date |  |  |  |  |  | Jul. 01, 2018 |  |  |  |  |
Common stock available for issuance employee stock purchase plans |  |  |  |  |  | 4,275,000 |  |  |  |  |
Shares available for issuance, per offering period |  |  |  |  |  | 400,000 |  |  |  |  |
Shares issued under ESPP |  |  |  |  |  | 126,330 | 117,757 | 137,215 |  |  |
Additional stock repurchase authorized |  |  |  |  |  |  |  |  | 80,000,000 |  |
Repurchase of common stock | 21,200,000 |  |  |  |  | 22,200,000 |  |  |  |  |
Purchase price per share |  |  |  |  |  | $ 3.62 | $ 3.52 |  |  |  |
Amount available under repurchase plan |  |  |  |  |  | 4,600,000 |  |  |  |  |
Annual cash dividend per share |  |  |  |  |  | $ 0.10 |  |  |  |  |
Dividend payment |  |  |  |  |  | (3,096,000) | (3,081,000) |  |  |  |
Number of shares issuable per right |  | 0.001 |  |  |  |  |  |  |  |  |
Purchase price of rights |  | 32.50 |  |  |  |  |  |  |  |  |
Percentage of outstanding common stock for determining exercisability of plan right |  | 15.00% |  |  |  |  |  |  |  |  |
Wanger Asset Management, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding common stock for determining exercisability of plan right |  | 20.00% |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Price per share repurchased in tender offer |  |  | $ 6.50 | $ 5.75 |  |  |  |  |  |  |
Period of service qualification |  |  |  |  |  | 3 months |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Price per share repurchased in tender offer |  |  | $ 7.00 | $ 6.50 |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase authorized |  |  |  |  |  | 90,000,000 |  |  |  |  |
Additional stock repurchase authorized |  |  |  |  |  | $ 5,000,000 |  |  |  |  |

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