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Commitments and Contingencies (Details) £ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 29, 2018 USD ($) | Dec. 30, 2017 USD ($) | Dec. 29, 2018 USD ($) | Dec. 30, 2017 USD ($) | Dec. 29, 2018 GBP (£) | Jun. 30, 2018 USD ($) | Jul. 02, 2016 GBP (£) | Jun. 30, 2016 GBP (£)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Guarantee liabilities | $ 0 |  | $ 0 |  |  | $ 0 |  |
Charge to discontinued operations | 2,400,000 | $ 0 | 2,400,000 | $ 0 |  |  |  |
Standby letters of credit | 11,000,000 |  | $ 11,000,000 |  |  |  |  |
Product Warranties |  |  |  |  |  |  |  |
Warranty Term for most products |  |  | 3 years |  |  |  |  |
Changes in warranty reserve |  |  |  |  |  |  |  |
Balance as of beginning of period | 9,000,000 | 6,400,000 | $ 8,200,000 | 5,800,000 |  |  |  |
Provision for warranty | 1,000,000 | 1,700,000 | 1,400,000 | 2,200,000 |  |  |  |
Utilization of reserve | (1,500,000) | (2,600,000) | (2,700,000) | (3,500,000) |  |  |  |
Adjustments related to pre-existing warranties (including changes in estimates) | 700,000 | 1,300,000 | 2,300,000 | 2,000,000 |  |  |  |
Acquisition related | 0 | 0 | 0 | 300,000 |  |  |  |
Balance as of end of period | 9,200,000 | $ 6,800,000 | 9,200,000 | $ 6,800,000 |  |  |  |
Performance bond |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Guarantee liabilities | 1,500,000 |  | 1,500,000 |  |  |  |  |
Judicial ruling | Case related to amendment of pension for foreign subsidiary |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Loss contingency accrual | 7,500,000 |  | $ 7,500,000 |  | £ 5.9 |  |  |
Minimum | Judicial ruling | Case related to amendment of pension for foreign subsidiary |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Estimated liability | £ |  |  |  |  |  |  |  | £ 5.7
Loss contingency accrual | £ |  |  |  |  |  |  | £ 5.7 |
Maximum | Judicial ruling | Case related to amendment of pension for foreign subsidiary |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Estimated liability | £ |  |  |  |  |  |  |  | £ 8.4
Spinoff | Lumentum |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Charge to discontinued operations | $ 2,400,000 |  |  |  |  |  |  |

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