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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
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Net income attributable to stockholders of Masimo Corporation:        
Net income $ 49,405 $ 49,085 $ 169,633 $ 143,295
Basic net income per share:        
Weighted-average shares outstanding - basic 54,997 53,535 54,543 53,367
Net income per basic share $ 0.90 $ 0.92 $ 3.11 $ 2.69
Diluted net income per share:        
Weighted-average shares outstanding - basic 54,997 53,535 54,543 53,367
Diluted share equivalent: stock options, RSUs and PSUs 3,283 3,727 3,490 3,688
Weighted-average shares outstanding - diluted 58,280 57,262 58,033 57,055
Net income per diluted share $ 0.85 $ 0.86 $ 2.92 $ 2.51