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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 28, 2018 | Sep. 29, 2017 | Sep. 28, 2018 | Sep. 29, 2017 | Dec. 31, 2017 | Sep. 27, 2018 | Jan. 10, 2017
Income Taxes [Line Items] |  |  |  |  |  |  |
Statutory tax rate | 21.00% |  | 21.00% |  | 35.00% |  |
Effective tax rate on income from operations | 19.50% | 11.90% | 17.30% | 11.60% |  |  |
Gain on acquisition of business |  |  |  | $ 26,409 |  |  |
Deferred tax liability write off |  | $ 1,500 |  | $ 1,500 |  |  |
Favorable impact on effective tax rate, write off percentage |  |  |  | 13.70% |  |  |
Additional income tax provision from revaluation of certain deferred tax assets and liabilities at the new tax rate |  |  |  |  | $ 2,800 |  |
Income tax measurement period under ASU 2018-05 |  |  | 1 year |  |  |  |
Laser Quantum |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Percentage of additional shares acquired |  |  |  |  |  | 24.00% | 35.00%
Canada Revenue Agency | CANADA |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Statutory tax rate | 29.00% | 29.00% | 29.00% | 29.00% |  |  |

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