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Computation of Basic and Diluted Earnings per Common Share (Parenthetical) (Details) - shares |  | 3 Months Ended | 9 Months Ended
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Sep. 27, 2018 | Sep. 28, 2018 | Sep. 29, 2017 | Sep. 28, 2018 | Sep. 29, 2017
EPS Performance-based Restricted Stock Units |  |  |  |  |
Computation Of Earnings Per Share [Line Items] |  |  |  |  |
Contingently issuable shares excluded from calculation of denominator |  | 53,968 | 53,968 | 53,968 | 53,968
Laser Quantum | Restricted Stock |  |  |  |  |
Computation Of Earnings Per Share [Line Items] |  |  |  |  |
Contingently issuable shares excluded from calculation of denominator | 213,219 | 213,219 |  | 213,219 |

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- Definition Computation of earnings per share. + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute earnings per share (EPS) in the future that were not included in the computation of diluted EPS because vesting conditions were not met for the period presented. + References No definition available. + Details
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- Definition Number of shares of equity interests issued or issuable to repurchase redeemable noncontrolling interest. + References No definition available. + Details
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