Income Taxes - Schedule of Effective Income Tax Rate and Amount Reconciliation (Current Year) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Sep. 29, 2025 |
Jun. 28, 2026 |
Jun. 28, 2026 |
Jun. 29, 2025 |
Jun. 30, 2024 |
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| Income Tax Disclosure [Abstract] | |||||
| Tax Jurisdiction of Domicile [Extensible Enumeration] | United States | United States | United States | ||
| Amount | |||||
| U.S. Federal Statutory Tax Rate | $ 89.0 | $ (87.0) | $ (340.0) | $ (120.2) | |
| Nontaxable or Nondeductible items: | |||||
| Transaction fees | 14.6 | 0.0 | |||
| Stock-based compensation | 21.9 | 0.0 | 14.2 | 8.8 | |
| Effects of restructuring | 60.0 | 0.0 | |||
| Changes in valuation allowances | (186.2) | 88.4 | 309.1 | 127.0 | |
| Other | 3.8 | (1.2) | 0.2 | 0.2 | |
| State and Local Income Taxes, Net of Federal Income Tax Effect | 0.0 | 0.1 | (13.8) | (5.0) | |
| Foreign Tax Effects | 0.4 | 1.1 | 0.1 | 0.0 | |
| Income tax expense (benefit) | $ 3.5 | $ 1.4 | $ (9.7) | $ 1.1 | |
| Percent | |||||
| U.S. Federal Statutory Tax Rate | 21.00% | 21.00% | 21.00% | 21.00% | |
| Nontaxable or Nondeductible items: | |||||
| Transaction fees | 3.50% | 0.00% | |||
| Stock-based compensation | 5.20% | 0.00% | (1.00%) | (2.00%) | |
| Effects of restructuring | 14.10% | 0.00% | |||
| Changes in valuation allowances | (44.00%) | (21.30%) | (19.00%) | (22.00%) | |
| Other | 0.90% | 0.30% | 0.00% | 0.00% | |
| State and Local Income Taxes, Net of Federal Income Tax Effect | 0.00% | 0.00% | 1.00% | 1.00% | |
| Foreign Tax Effects | 0.10% | (0.30%) | 0.00% | 0.00% | |
| Income tax expense and effective tax rate | 0.80% | (0.30%) | 1.00% | 0.00% | |
| X | ||||||||||
- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Percentage 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 changes in the valuation allowance for deferred tax assets. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Percentage 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 applicable to statutory income tax expense (benefit) outside of the country of domicile. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Percentage 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 restructuring charges. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Percentage of difference between reported income tax expense (benefit) and 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 share-based payment arrangement. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Percentage 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. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Percentage 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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- 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 the valuation allowance for deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- 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 foreign income tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- 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 nondeductible restructuring charges. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- 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). Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Indicates tax jurisdiction of domicile. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Effective Income Tax Rate Reconciliation, Nondeductible Expense, Transaction Fees, Amount No definition available.
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- Definition Effective Income Tax Rate Reconciliation, Nondeductible Expense, Transaction Fees, Percent No definition available.
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