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