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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 Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 01, 2022
Oct. 02, 2021
Jul. 03, 2021
Apr. 03, 2021
Sep. 26, 2020
Jun. 27, 2020
Mar. 28, 2020
Jan. 01, 2022
Jan. 02, 2021
Dec. 28, 2019
Net income attributable to stockholders of Masimo Corporation:                    
Net income               $ 229,647 $ 240,282 $ 196,216
Net Income (Loss) Attributable to Parent $ 68,258 $ 57,771 $ 50,235 $ 53,375 $ 49,405 $ 55,772 $ 64,456      
Basic net income per share:                    
Weighted-average shares outstanding - basic               55,166 54,700 53,434
Net income per basic share $ 1.23 $ 1.05 $ 0.91 $ 0.97 $ 0.90 $ 1.02 $ 1.20 $ 4.16 $ 4.39 $ 3.67
Diluted net income per share:                    
Weighted-average shares outstanding - basic               55,166 54,700 53,434
Diluted share equivalents: stock options and RSUs               2,516 3,337 3,666
Weighted-average shares outstanding - diluted               57,682 58,037 57,100
Net income per diluted share $ 1.18 $ 1.00 $ 0.88 $ 0.92 $ 0.85 $ 0.96 $ 1.12 $ 3.98 $ 4.14 $ 3.44