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Income Taxes - Effective Income Tax Rate and Amount Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
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%