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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 6 Months Ended
Jul. 03, 2021
Apr. 03, 2021
Jun. 27, 2020
Mar. 28, 2020
Jul. 03, 2021
Jun. 27, 2020
Net income attributable to stockholders of Masimo Corporation:            
Net income $ 50,235 $ 53,383 $ 55,772 $ 64,456 $ 103,618 $ 120,228
Basic net income per share:            
Weighted-average shares outstanding - basic 55,032   54,764   55,116 54,316
Net income per basic share $ 0.91   $ 1.02   $ 1.88 $ 2.21
Diluted net income per share:            
Weighted-average shares outstanding - basic 55,032   54,764   55,116 54,316
Diluted share equivalent: stock options, RSUs and PSUs 2,347   3,440   2,514 3,597
Weighted-average shares outstanding - diluted 57,379   58,204   57,630 57,913
Net income per diluted share $ 0.88   $ 0.96   $ 1.80 $ 2.08