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Commitments and Contingencies - Narrative (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 26, 2021 USD ($) | Dec. 27, 2020 endowedFacultyChair | Sep. 27, 2020 USD ($) | Sep. 26, 2021 USD ($) | Jun. 27, 2021 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
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 |  |  |  | $ 101,100,000 |
Reimbursement of property and equipment purchases from long-term incentive agreement | $ 50,800,000 |  | $ 0 | $ 61,500,000 |
Reimbursement of property and equipment purchases from long-term incentive agreement, receivables | 26,400,000 |  |  |  |
Reimbursement of property and equipment purchases from long-term incentive agreement, other assets | $ 13,200,000 |  |  |  |
Minimum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Annual cost of GDA |  |  |  |  | $ 2,500,000
Maximum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Potential total grant amount of GDA |  |  |  |  | 500,000,000
Annual cost of GDA |  |  |  |  | $ 5,200,000

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