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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. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Accounting Policies [Abstract]        
Options to purchase of shares of common stock 400 1,200 300 1,100
Net income attributable to stockholders of Masimo Corporation:        
Net income $ 44,888 $ 43,853 $ 94,210 $ 89,483
Net income        
Net income $ 44,888 $ 43,853 $ 94,210 $ 89,483
Weighted-average shares outstanding - basic 53,356 51,999 53,283 52,047
Net income per basic share $ 0.84 $ 0.84 $ 1.77 $ 1.72
Diluted net income per share:        
Weighted-average shares outstanding - basic 53,356 51,999 53,283 52,047
Diluted share equivalent: stock options, RSUs and PSUs 3,710 3,743 3,657 3,795
Weighted-average shares outstanding - diluted 57,066 55,742 56,940 55,842
Net income per diluted share $ 0.79 $ 0.79 $ 1.65 $ 1.60