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Acquisitions - Fair Value of Consideration Transferred (Details) - USD ($) $ in Millions | May 31, 2019 | Oct. 30, 2018 | Jun. 27, 2020 | Jun. 29, 2019
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Business Acquisition [Line Items] |  |  |  |
Fair value of contingent consideration |  |  | $ 9.9 | $ 38.4
3Z Telecom, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash consideration paid at closing | $ 18.9 |  |  |
Escrow payments | 4.3 |  |  |
Fair value of contingent consideration | 5.5 |  |  |
Total purchase consideration | $ 28.7 |  |  |
RPC Photonics, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash consideration paid at closing |  | $ 29.9 |  |
Escrow payments |  | 3.5 |  |
Fair value of contingent consideration |  | 36.2 | $ 0.0 |
Total purchase consideration |  | $ 69.6 |  |

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