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Income Taxes - Effective Income Tax Rate and Amount Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 25, 2023 | Jun. 26, 2022 | Jun. 27, 2021
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Federal income tax provision at statutory rate | $ (69.0) | $ (60.1) | $ (71.4)
State tax provision, net of federal benefit | (1.2) | (2.5) | (1.9)
Tax exempt interest | (0.5) | (0.2) | (0.1)
(Decrease) increase in tax reserve | (0.4) | (0.2) | 0.0
Research and development credits | (10.8) | (5.4) | (4.3)
Foreign tax credit | 0.0 | (0.3) | (0.4)
Increase (decrease) in valuation allowance | 79.7 | (51.6) | 75.0
Extinguishment of convertible notes | 0.0 | (4.5) | 0.0
Stock-based compensation | 3.0 | (3.3) | (2.8)
Statutory rate differences | 0.1 | 0.0 | 1.1
Foreign earnings taxed in U.S. | (0.4) | 6.8 | 2.7
Other foreign adjustments | 0.0 | 0.0 | (0.1)
Provision to return adjustments | 0.1 | 0.3 | (0.2)
Impact of rate changes | 0.0 | 0.5 | 2.7
Expiration of state credits | 0.2 | 0.1 | 0.7
Corporate restructuring adjustment | 0.0 | 129.1 | 0.0
Other | 0.6 | 0.3 | 0.1
Income tax expense | $ 1.4 | $ 9.0 | $ 1.1
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Federal income tax provision at statutory rate | 21.00% | 21.00% | 21.00%
State tax provision, net of federal benefit | 0.00% | 1.00% | 1.00%
Tax exempt interest | 0.00% | 0.00% | 0.00%
(Decrease) increase in tax reserve | 0.00% | 0.00% | 0.00%
Research and development credits | 3.00% | 2.00% | 1.00%
Foreign tax credit | 0.00% | 0.00% | 0.00%
Increase (decrease) in valuation allowance | (24.00%) | 18.00% | (22.00%)
Extinguishment of convertible notes | 0.00% | 2.00% | 0.00%
Stock-based compensation | (1.00%) | 1.00% | 1.00%
Statutory rate differences | 0.00% | 0.00% | 0.00%
Foreign earnings taxed in U.S. | 0.00% | (2.00%) | (1.00%)
Other foreign adjustments | 0.00% | 0.00% | 0.00%
Provision to return adjustments | 0.00% | 0.00% | 0.00%
Impact of rate changes | 0.00% | 0.00% | (1.00%)
Expiration of state credits | 0.00% | 0.00% | 0.00%
Corporate restructuring adjustment | 0.00% | (45.00%) | 0.00%
Other | 0.00% | 0.00% | 0.00%
Income tax expense | 0.00% | (3.00%) | 0.00%

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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