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Discontinued Operations - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended | 31 Months Ended
--- | --- | --- | ---
Jun. 11, 2018 | Dec. 26, 2021 | Dec. 27, 2020 | Dec. 29, 2019 | Dec. 27, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Final working capital settlement |  | $ 1.1 |  |  |
Final working capital settlement related expenses |  | 1.1 |  |  |
Other income |  |  |  | $ 3.6 |
Public Safety & Security | Discontinued Operations, Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Purchase price, in cash | $ 69.0 |  |  |  |
Sale of discontinued operations |  |  |  |  | $ 68.9
Working capital adjustments | $ 7.3 |  |  |  |
Herley | Discontinued Operations, Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Other income |  | 0.0 | $ 0.0 | 3.6 |
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 |  | $ 0.0 | $ 0.0 | $ 0.0 |

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