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Summary of Significant Accounting Policies - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
Jan. 01, 2022
Jan. 02, 2021
Net income attributable to stockholders of Masimo Corporation:      
Net income $ 143.5 $ 229.6 $ 240.3
Basic net income per share:      
Weighted-average shares outstanding - basic (in shares) 53.6 55.2 54.7
Net income per basic share (in dollars per share) $ 2.68 $ 4.16 $ 4.39
Diluted net income per share:      
Weighted-average shares outstanding - basic (in shares) 53.6 55.2 54.7
Diluted share equivalents: stock options and RSUs (in shares) 1.6 2.5 3.3
Weighted-average shares outstanding - diluted (in shares) 55.2 57.7 58.0
Net income per diluted share (in dollars per share) $ 2.60 $ 3.98 $ 4.14