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Commitments and Contingencies - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 28, 2020
endowedFacultyChair
Dec. 27, 2020
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  
Minimum    
Loss Contingencies [Line Items]    
Annual cost of GDA   $ 1,000,000.0
Maximum    
Loss Contingencies [Line Items]    
Potential total grant amount of GDA   500,000,000.0
Annual cost of GDA   $ 5,200,000