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Income Taxes - Schedule of Effective Income Tax Rate and Amount Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 29, 2025	Jun. 30, 2024	Jun. 25, 2023
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal income tax provision at statutory rate	$ (340.0)	$ (120.2)	$ (54.6)
State tax provision, net of federal benefit	(13.8)	(5.0)	(0.7)
Tax exempt interest	(0.1)	(0.4)	(0.5)
(Decrease) increase in tax reserve	(0.4)	(2.0)	(0.4)
Research and development credits	(7.3)	(9.7)	(8.7)
Increase (decrease) in valuation allowance	309.1	127.0	62.0
Stock-based compensation	14.2	8.8	3.0
Statutory rate differences	0.1	0.0	0.1
Foreign earnings taxed in U.S.	3.5	0.4	(0.4)
Goodwill Impairment	23.1	0.0	0.0
Provision to return adjustments	0.9	(0.4)	0.1
Impact of rate changes	(3.4)	0.4	0.0
Expiration of attributes	0.1	2.0	0.2
Pre-petition charges	4.1	0.0	0.0
Other	0.2	0.2	0.6
Income tax expense	$ (9.7)	$ 1.1	$ 0.7
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	1.00%	1.00%	0.00%
Tax exempt interest	0.00%	0.00%	0.00%
(Decrease) increase in tax reserve	0.00%	0.00%	0.00%
Research and development credits	1.00%	2.00%	3.00%
Increase (decrease) in valuation allowance	(19.00%)	(22.00%)	(24.00%)
Stock-based compensation	(1.00%)	(2.00%)	(1.00%)
Statutory rate differences	0.00%	0.00%	0.00%
Foreign earnings taxed in U.S.	0.00%	0.00%	0.00%
Goodwill Impairment	(1.00%)	0.00%	0.00%
Provision to return adjustments	0.00%	0.00%	0.00%
Impact of rate changes	0.00%	0.00%	0.00%
Expiration of attributes	0.00%	0.00%	0.00%
Pre-petition charges	0.00%	0.00%	0.00%
Other	0.00%	0.00%	0.00%
Income tax expense	1.00%	0.00%	0.00%

X

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 3: 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

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