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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
Mar. 30, 2019
Mar. 31, 2018
Accounting Policies [Abstract]    
Options to purchase of shares of common stock 300 900
Net income attributable to stockholders of Masimo Corporation:    
Net income $ 49,322 $ 45,630
Net income    
Net income $ 49,322 $ 45,630
Weighted-average shares outstanding - basic 53,210 51,709
Net income per basic share $ 0.93 $ 0.88
Diluted net income per share:    
Weighted-average shares outstanding - basic 53,210 51,709
Diluted share equivalent: stock options, RSUs and PSUs 3,589 3,787
Weighted-average shares outstanding - diluted 56,799 55,496
Net income per diluted share $ 0.87 $ 0.82