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Commitments and Contingencies - Guarantees and Outstanding Letters of Credit and Performance Bonds (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 27, 2020 | Mar. 28, 2020 | Dec. 28, 2019 | Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Dec. 29, 2018 | Sep. 29, 2018 | Jun. 27, 2020 | Jun. 29, 2019 | Jun. 30, 2018
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Guarantee liabilities | $ 0.0 |  |  |  | $ 0.0 |  |  |  | $ 0.0 | $ 0.0 |
Charge to discontinued operations | 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | $ 2.4 | $ 0.0 | 0.0 | $ 2.4 | $ 0.0
Standby letters of credit |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingency | 7.4 |  |  |  |  |  |  |  | 7.4 |  |
Performance bonds |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingency | $ 1.0 |  |  |  |  |  |  |  | $ 1.0 |  |
Spinoff | Lumentum |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Charge to discontinued operations |  |  |  |  |  |  | $ 2.4 |  |  |  |

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