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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. 27, 2021 | Jun. 28, 2020 | Jun. 30, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Federal income tax provision at statutory rate | $ (71.4) | $ (43.2) | $ (25.8)
State tax provision, net of federal benefit | 1.00% | 1.00% | 2.00%
State tax provision, net of federal benefit | $ (1.9) | $ (1.9) | $ (2.0)
Tax exempt interest | 0.00% | 0.00% | 0.00%
Tax exempt interest | $ (0.1) | $ (0.5) | $ (0.4)
(Decrease) increase in tax reserve | 0.0 | (0.3) | 0.5
Research and development credits | (4.3) | (3.3) | (2.8)
Foreign tax credit | (0.4) | (0.3) | (0.4)
Increase (decrease) in valuation allowance | 75.0 | 50.3 | 4.3
Partial extinguishment of convertible notes | 0.0 | (6.0) | 0.0
Stock-based compensation | (2.8) | 2.1 | 0.7
Statutory rate differences | 1.1 | 1.2 | 6.0
Foreign earnings taxed in U.S. | 2.7 | 0.3 | 0.4
Other foreign adjustments | (0.1) | 0.3 | (0.1)
Net operating loss carryback | 0.0 | (7.2) | 0.0
Provision to return adjustments | (0.2) | (1.3) | 11.8
Tax on distributable foreign earnings | 0.0 | 0.0 | 0.0
Impact of rate changes | 2.7 | 0.8 | 2.7
Expiration of state credits | 0.7 | 0.9 | 1.2
Other | 0.1 | 0.1 | (0.5)
Income tax expense (benefit) | $ 1.1 | $ (8.0) | $ (4.4)
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Federal income tax provision at statutory rate | 21.00% | 21.00% | 21.00%
(Decrease) increase in tax reserve | 0.00% | 0.00% | 0.00%
Research and development credits | 1.00% | 2.00% | 2.00%
Foreign tax credit | 0.00% | 0.00% | 0.00%
Increase (decrease) in valuation allowance | (22.00%) | (25.00%) | (4.00%)
Partial extinguishment of convertible notes | 0.00% | 3.00% | 0.00%
Stock-based compensation | 1.00% | (1.00%) | (1.00%)
Statutory rate differences | 0.00% | (1.00%) | (5.00%)
Foreign earnings taxed in U.S. | (1.00%) | 0.00% | 0.00%
Other foreign adjustments | 0.00% | 0.00% | 0.00%
Net operating loss carryback | 0.00% | 4.00% | 0.00%
Provision to return adjustments | 0.00% | 1.00% | (10.00%)
Tax on distributable foreign earnings | 0.00% | 0.00% | 0.00%
Impact of rate changes | (1.00%) | 0.00% | (2.00%)
Expiration of state credits | 0.00% | 0.00% | (1.00%)
Other | 0.00% | 0.00% | 0.00%
Income tax expense (benefit) | 0.00% | 4.00% | 4.00%

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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + 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 other adjustments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + 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 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + 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 increase (decrease) in income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + 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 income (loss) exempt from income taxes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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