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Employee Benefits - Narrative (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
plan
Jan. 01, 2022
USD ($)
Dec. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
plan
Jan. 01, 2022
USD ($)
Jan. 02, 2021
USD ($)
Defined Contribution Plan Disclosure [Line Items]            
Defined contribution plan, number of plans | plan 1     1    
Expected long-term return on plan assets       1.70% 0.00%  
Benefits paid       $ 2,800,000    
Actual net loss on plan assets       (2,500,000)    
Benefits paid       2,000,000    
Actuarial loss       1,900,000    
Unfunded balance $ (10,100,000)     (10,100,000)    
Employer contributions       $ 1,500,000 $ 0  
Forecast [Member]            
Defined Contribution Plan Disclosure [Line Items]            
Employer contributions     $ 1,700,000      
Masimo Retirement Savings Plan            
Defined Contribution Plan Disclosure [Line Items]            
Percent of employees pay       100.00%    
Percent of match       3.00%    
Company's contribution to employee retirement savings plan $ 4,500,000 $ 3,400,000       $ 3,200,000
Masimo Retirement Savings Plan | Foreign Plan            
Defined Contribution Plan Disclosure [Line Items]            
Company's contribution to employee retirement savings plan       $ 4,300,000