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Summary of Significant Accounting Policies - Schedule of Supplemental Cash Flow Information (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 29, 2024
Jul. 01, 2023
Dec. 30, 2023
Dec. 31, 2022
Cash paid during the year for:        
Interest expense $ 22.2 $ 23.3    
Income taxes 25.5 24.0    
Operating lease liabilities 12.1 10.6    
Non-cash operating activities:        
ROU assets obtained in exchange for lease liabilities 23.2 1.7    
Non-cash investing activities:        
Unpaid purchases of property and equipment 2.8 1.2    
Unpaid strategic investments 0.2 0.9    
Non-cash financing activities:        
Unsettled common stock proceeds from option exercises 0.1 0.1    
Reconciliation of cash, cash equivalents and restricted cash:        
Cash and cash equivalents 129.6 150.7 $ 163.0  
Restricted cash 6.0 7.9    
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows $ 135.6 $ 158.6 $ 168.2 $ 209.6