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Accumulated Other Comprehensive Loss (Details) - USD ($) | 12 Months Ended
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Jun. 29, 2019 | Jun. 30, 2018 | Jul. 01, 2017
Changes in accumulated other comprehensive income (loss) by component |  |  |
Beginning balance | $ 734,900,000 | $ 803,500,000 | $ 689,300,000
Other comprehensive (loss) income before reclassification | (34,000,000.0) |  |
Amounts reclassified from accumulated other comprehensive (loss) income | 2,300,000 |  |
Net change in accumulated other comprehensive (loss) income | (31,700,000) | (10,300,000) | (102,400,000)
Ending balance | 725,800,000 | 734,900,000 | 803,500,000
Unrealized actuarial loss | 10,100,000 |  |
Income tax benefit | 2,800,000 |  |
Available-for-sale securities | Lumentum |  |  |
Changes in accumulated other comprehensive income (loss) by component |  |  |
Tax impact from reclassification of gross realized gain from available-for-sale securities | 0 |  |
Total |  |  |
Changes in accumulated other comprehensive income (loss) by component |  |  |
Beginning balance | (102,900,000) | (92,600,000) | 10,000,000.0
Net change in accumulated other comprehensive (loss) income | (31,700,000) | (10,300,000) | (102,400,000)
Ending balance | (134,600,000) | (102,900,000) | $ (92,600,000)
Unrealized gains (losses) on available-for-sale investments |  |  |
Changes in accumulated other comprehensive income (loss) by component |  |  |
Beginning balance | (5,800,000) |  |
Other comprehensive (loss) income before reclassification | 300,000 |  |
Amounts reclassified from accumulated other comprehensive (loss) income | 500,000 |  |
Net change in accumulated other comprehensive (loss) income | 800,000 |  |
Ending balance | (5,000,000.0) | (5,800,000) |
Foreign currency translation adjustments |  |  |
Changes in accumulated other comprehensive income (loss) by component |  |  |
Beginning balance | (74,000,000.0) |  |
Other comprehensive (loss) income before reclassification | (27,000,000.0) |  |
Amounts reclassified from accumulated other comprehensive (loss) income | 0 |  |
Net change in accumulated other comprehensive (loss) income | (27,000,000.0) |  |
Ending balance | (101,000,000.0) | (74,000,000.0) |
Change in unrealized components of defined benefit obligations, net of tax |  |  |
Changes in accumulated other comprehensive income (loss) by component |  |  |
Beginning balance | (23,100,000) |  |
Other comprehensive (loss) income before reclassification | (7,300,000) |  |
Amounts reclassified from accumulated other comprehensive (loss) income | 1,800,000 |  |
Net change in accumulated other comprehensive (loss) income | (5,500,000) |  |
Ending balance | $ (28,600,000) | $ (23,100,000) |

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