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Discontinued Operations (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 11, 2018 | Dec. 30, 2018 | Dec. 31, 2017 | Dec. 25, 2016 | Nov. 30, 2017
Senior notes | 6.5% Notes |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Stated interest rate |  |  |  |  | 6.50%
Public Safety & Security | Disposal Group, Held-for-sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Purchase price, in cash | $ 69.0 |  |  |  |
Working capital adjustments | 8.0 |  |  |  |
Proceeds from divestiture | 70.0 |  |  |  |
Working capital retained | 7.0 |  |  |  |
Transaction costs | $ 2.7 |  |  |  |
Herley | Discontinued Operations, Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cost adjustments |  | $ 2.0 |  |  |
Transaction-related costs |  | 2.7 |  |  |
Income tax expense (benefit) reclassification |  | 2.1 |  |  |
Herley | Discontinued Operations, Disposed of by Sale | Selling, general and administrative expenses |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Depreciation and amortization expense |  | $ 0.1 | $ 0.3 | $ 0.3 |

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