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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
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Accounting Policies [Abstract]        
Options to purchase of shares of common stock 1,200 100 1,100 100
Net income attributable to stockholders of Masimo Corporation:        
Net income $ 43,853 $ 45,138 $ 89,483 $ 96,671
Net income 43,853 45,138 89,483 96,671
Net income        
Net income $ 43,853 $ 45,138 $ 89,483 $ 96,671
Weighted-average shares outstanding - basic 51,999 51,677 52,047 51,164
Net income per basic share $ 0.84 $ 0.87 $ 1.72 $ 1.89
Diluted net income per share:        
Weighted-average shares outstanding - basic 51,999 51,677 52,047 51,164
Diluted share equivalent: stock options and RSUs 3,743 4,496 3,795 4,704
Weighted-average shares outstanding - diluted 55,742 56,173 55,842 55,868
Net income per diluted share $ 0.79 $ 0.80 $ 1.60 $ 1.73