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Employee Benefits - Narrative (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 30, 2023
USD ($)
plan
Dec. 31, 2022
USD ($)
Dec. 30, 2023
USD ($)
plan
Dec. 31, 2022
USD ($)
Jan. 01, 2022
USD ($)
Defined Contribution Plan Disclosure [Line Items]          
Defined contribution plan, number of plans | plan 1   1    
Expected long-term return on plan assets     3.53% 1.70%  
Other     $ 2.0 $ 1.8  
Defined benefit plan, plan assets, foreign currency revaluation     4.3    
Actual net gain on plan assets     1.1 (2.5)  
Benefits paid     0.8 2.8  
Other, includes translation     3.8 1.8  
Defined benefit plan, benefit obligation, foreign currency revaluation     6.1    
Actuarial gain     (2.3) (1.9)  
Unfunded balance $ (9.5) $ (10.1) (9.5) (10.1)  
Employer contributions     0.4 1.5  
Expected contributions for next fiscal year 1.8   $ 1.8    
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 $ 4.9 $ 4.5     $ 3.4
Masimo Retirement Savings Plan | Foreign Plan          
Defined Contribution Plan Disclosure [Line Items]          
Company's contribution to employee retirement savings plan     $ 5.5 $ 4.3 $ 0.0