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Commitments and Contingencies - Narrative (Details) |  | 3 Months Ended | 6 Months Ended | 54 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 08, 2025 lawsuit | Dec. 29, 2024 USD ($) | Jun. 28, 2020 endowedFacultyChair | Dec. 29, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 29, 2024 USD ($) | Jun. 30, 2024 USD ($) | Jun. 25, 2023 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Potential total grant amount of GDA |  | $ 500,000,000 |  | $ 500,000,000 |  | $ 500,000,000 |  |
GDA term |  |  | 13 years |  |  |  |  |
Duration of annual commitment fee payment of GDA |  |  | 6 years |  |  |  |  |
Number of endowed faculty chairs created | endowedFacultyChair |  |  | 2 |  |  |  |  |
Reduction in property, plant, and equipment |  |  |  |  |  | 500,000,000.0 |  |
Reimbursement of property and equipment purchases from long-term incentive agreement |  |  |  | 42,000,000.0 | $ 79,400,000 | 467,200,000 |  |
Reimbursement of property and equipment purchases from long-term incentive agreement, receivables |  |  |  |  |  | 32,800,000 |  |
Subsequent Event |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Loss contingency, number of additional lawsuits | lawsuit | 2 |  |  |  |  |  |  |
Purchase Commitment 2023 |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Purchase commitment, amount committed |  |  |  |  |  |  |  | $ 200,000,000.0
Current purchases under agreement |  | 5,800,000 |  | 12,500,000 |  |  |  |
Product purchases year three |  | 36,000,000.0 |  | 36,000,000.0 |  | 36,000,000.0 |  |
Product purchases year four |  | 50,100,000 |  | 50,100,000 |  | 50,100,000 |  |
Product purchases year five |  | 73,700,000 |  | 73,700,000 |  | 73,700,000 |  |
Capacity reserve deposit |  | 60,000,000.0 |  | 60,000,000.0 |  | 60,000,000.0 |  |
Prepaid supplies |  | 48,900,000 |  | 48,900,000 |  | 48,900,000 |  |
Purchase Commitment 2024 |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Purchase commitment, amount committed |  |  |  |  |  |  | $ 86,400,000 |
Current purchases under agreement |  | 7,200,000 |  | 14,400,000 |  |  |  |
Product purchases year two |  | 28,800,000 |  | 28,800,000 |  | 28,800,000 |  |
Product purchases year three |  | 9,600,000 |  | 9,600,000 |  | 9,600,000 |  |
Product purchases year one |  | $ 14,400,000 |  | 14,400,000 |  | $ 14,400,000 |  |
Minimum |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Annual cost of GDA |  |  |  | 2,200,000 |  |  |  |
Maximum |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Annual cost of GDA |  |  |  | $ 5,200,000 |  |  |  |

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