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Earnings per Share (Tables) | 3 Months Ended
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Mar. 29, 2013
Computation of Basic and Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share amounts):
|  | Three Months Ended |
|  | March 29, 2013 |  |  | March 30, 2012 |
Numerators: |  |  |  |  |  |  |  |
Amounts attributable to GSI Group Inc: |  |  |  |  |  |  |  |
Income from continuing operations |  | $ | 1,433 |  |  | $ | 1,059 |
Income from discontinued operations. |  |  | 649 |  |  |  | 322 |
Net income attributable to GSI Group Inc. |  | $ | 2,082 |  |  | $ | 1,381 |
Denominators: |  |  |  |  |  |  |  |
Weighted average common shares outstanding - basic |  |  | 33,983 |  |  |  | 33,679 |
Dilutive potential common shares |  |  | 288 |  |  |  | 199 |
Weighted average common shares outstanding - diluted |  |  | 34,271 |  |  |  | 33,878 |
Antidilutive common shares excluded from above |  |  | 373 |  |  |  | — |
Basic Earnings per Common Share: |  |  |  |  |  |  |  |
From continuing operations |  | $ | 0.04 |  |  | $ | 0.03 |
From discontinued operations |  | $ | 0.02 |  |  | $ | 0.01 |
Basic earnings per share attributable to GSI Group Inc. |  | $ | 0.06 |  |  | $ | 0.04 |
Diluted Earnings per Common Share: |  |  |  |  |  |  |  |
From continuing operations |  | $ | 0.04 |  |  | $ | 0.03 |
From discontinued operations |  | $ | 0.02 |  |  | $ | 0.01 |
Diluted earnings per share attributable to GSI Group Inc. |  | $ | 0.06 |  |  | $ | 0.04 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration