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Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2018 | Jul. 01, 2017 | Jul. 02, 2016
Changes in accumulated other comprehensive income (loss) by component |  |  |
Beginning balance | $ 786,400,000 | $ 689,300,000 | $ 1,101,400,000
Other comprehensive (loss) income before reclassification | (11,600,000) |  |
Amounts reclassified from accumulated other comprehensive (loss) income | 1,600,000 |  |
Net change in accumulated other comprehensive (loss) income | (10,000,000) | (102,400,000) | 65,800,000
Ending balance | 720,700,000 | 786,400,000 | 689,300,000
Unrealized actuarial loss | 2,400,000 |  |
Income tax benefit | 400,000 |  |
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 | (92,400,000) | 10,000,000 | (48,000,000)
Net change in accumulated other comprehensive (loss) income |  | (102,400,000) | 65,800,000
Ending balance | (102,400,000) | (92,400,000) | $ 10,000,000
Unrealized gains (losses) on available-for-sale investments |  |  |
Changes in accumulated other comprehensive income (loss) by component |  |  |
Beginning balance | (5,300,000) |  |
Other comprehensive (loss) income before reclassification | (600,000) |  |
Amounts reclassified from accumulated other comprehensive (loss) income | 100,000 |  |
Net change in accumulated other comprehensive (loss) income | (500,000) |  |
Ending balance | (5,800,000) | (5,300,000) |
Foreign currency translation adjustments |  |  |
Changes in accumulated other comprehensive income (loss) by component |  |  |
Beginning balance | (65,300,000) |  |
Other comprehensive (loss) income before reclassification | (8,200,000) |  |
Amounts reclassified from accumulated other comprehensive (loss) income | 0 |  |
Net change in accumulated other comprehensive (loss) income | (8,200,000) |  |
Ending balance | (73,500,000) | (65,300,000) |
Change in unrealized components of defined benefit obligations, net of tax |  |  |
Changes in accumulated other comprehensive income (loss) by component |  |  |
Beginning balance | (21,800,000) |  |
Other comprehensive (loss) income before reclassification | (2,800,000) |  |
Amounts reclassified from accumulated other comprehensive (loss) income | 1,500,000 |  |
Net change in accumulated other comprehensive (loss) income | (1,300,000) |  |
Ending balance | $ (23,100,000) | $ (21,800,000) |

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