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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