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Income Taxes (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 02, 2017 | Apr. 02, 2017 | Mar. 27, 2016 | Dec. 27, 2015 | Apr. 02, 2017 | Mar. 27, 2016
Effective tax rate (as a percent) |  |  |  |  | 30.40% | 38.20%
Income tax benefit |  | $ (12,990,000) | $ (8,661,000) |  | $ (23,348,000) | $ (16,692,000)
Tax benefit recognized in connection with the IRS examination |  | 1,200,000 |  |  |  |
Acquisition and integration expenses and debt pre-payment fees |  |  | 13,300,000 |  |  |
Income tax benefit on business combination acquisition and integration expenses and debt pre-payment fees |  |  | 0 |  |  |
Non-deductible expenses related to business acquisition |  |  | 6,400,000 |  |  |
Business combination integration costs and debt pre-payment fees |  |  | $ 6,900,000 |  |  |
R&D Credits |  |  |  | $ 2,000,000 |  |
Effective income tax rate excluding R&D credits (as a percent) |  |  | 32.70% |  |  | 32.70%
Foreign |  |  |  |  |  |
Reserve for uncertain tax position in connection with IRS examination |  | 2,300,000 |  |  |  |
Period of projected cumulative pre-tax losses in certain foreign jurisdictions |  |  |  |  | 36 months |
Loss carry-forwards, valuation allowance |  | 23,400,000 |  |  | $ 23,400,000 |
Forecast |  |  |  |  |  |
Estimated amount of payment to IRS | $ 20,000,000 |  |  |  |  |
Accounting Standards Update 2016-09 |  |  |  |  |  |
Income tax benefit |  | $ 900,000 |  |  | $ 2,700,000 |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction of business combination and integration and debt pre-payment fees. + References No definition available. + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible business combination acquisition related expenses. + References No definition available. + Details
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