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Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 02, 2021
Jul. 03, 2021
Apr. 03, 2021
Sep. 26, 2020
Jun. 27, 2020
Mar. 28, 2020
Oct. 02, 2021
Sep. 26, 2020
Net income attributable to stockholders of Masimo Corporation:                
Net income $ 57,771 $ 50,235 $ 53,383 $ 49,405 $ 55,772 $ 64,456 $ 161,389 $ 169,633
Basic net income per share:                
Weighted-average shares outstanding - basic 55,143     54,997     55,125 54,543
Net income per basic share $ 1.05     $ 0.90     $ 2.93 $ 3.11
Diluted net income per share:                
Weighted-average shares outstanding - basic 55,143     54,997     55,125 54,543
Diluted share equivalent: stock options, RSUs and PSUs 2,521     3,283     2,526 3,490
Weighted-average shares outstanding - diluted 57,664     58,280     57,651 58,033
Net income per diluted share $ 1.00     $ 0.85     $ 2.80 $ 2.92