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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. 28, 2020 | Jun. 30, 2019 | Jun. 24, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Federal income tax provision at statutory rate | $ (40.0) | $ (9.5) | $ (5.0)
State tax provision, net of federal benefit | (2.0) | (1.4) | (3.4)
Tax exempt interest | (0.6) | (0.4) | (1.2)
48C investment tax credit | 0.0 | 0.0 | (1.6)
(Decrease) increase in tax reserve | (0.3) | 0.5 | 0.1
Research and development credits | (4.5) | (3.9) | (1.7)
Foreign tax credit | (0.5) | (0.5) | (39.4)
Increase (decrease) in valuation allowance | 55.3 | 8.2 | (24.5)
Partial extinguishment of convertible notes | (6.0) | 0.0 | 0.0
Stock-based compensation | 1.7 | 0.0 | 9.0
Statutory rate differences | 1.5 | 1.9 | (2.0)
Foreign earnings taxed in U.S. | 0.5 | 0.9 | 52.1
Foreign currency fluctuations | 0.6 | 0.7 | (1.3)
Other foreign adjustments | 0.5 | (0.1) | (0.4)
Net operating loss carryback | (7.2) | 0.0 | (0.1)
Provision to return adjustments | (1.3) | 11.8 | 0.0
Tax on distributable foreign earnings | 0.6 | 1.0 | 5.4
Impact of rate changes | 0.8 | 2.7 | 11.2
Expiration of state credits | 0.9 | 1.2 | 1.3
Other | 0.2 | (0.4) | 0.3
Income tax expense (benefit) | $ 0.2 | $ 12.7 | $ (1.2)
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Federal income tax provision at statutory rate | 21.00% | 21.00% | 28.00%
State tax provision, net of federal benefit | 1.00% | 3.00% | 19.00%
Tax exempt interest | 0.00% | 1.00% | 7.00%
48C investment tax credit | 0.00% | 0.00% | 9.00%
(Decrease) increase in tax reserve | 0.00% | (1.00%) | (1.00%)
Research and development credits | 2.00% | 9.00% | 10.00%
Foreign tax credit | 0.00% | 1.00% | 224.00%
Increase (decrease) in valuation allowance | (29.00%) | (18.00%) | 139.00%
Partial extinguishment of convertible notes | 3.00% | 0.00% | 0.00%
Stock-based compensation | (1.00%) | 0.00% | (51.00%)
Statutory rate differences | (1.00%) | (4.00%) | 11.00%
Foreign earnings taxed in U.S. | 0.00% | (2.00%) | (296.00%)
Foreign currency fluctuations | 0.00% | (2.00%) | 7.00%
Other foreign adjustments | 0.00% | 0.00% | 2.00%
Net operating loss carryback | 4.00% | 0.00% | 1.00%
Provision to return adjustments | 1.00% | (26.00%) | 0.00%
Tax on distributable foreign earnings | 0.00% | (2.00%) | (31.00%)
Impact of rate changes | 0.00% | (6.00%) | (64.00%)
Expiration of state credits | (1.00%) | (3.00%) | (7.00%)
Other | 0.00% | 1.00% | (2.00%)
Income tax expense (benefit) | 0.00% | (28.00%) | 7.00%

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