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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
Apr. 02, 2022
Apr. 03, 2021
Net income attributable to stockholders of Masimo Corporation:    
Net income $ 46,595 $ 53,383
Basic net income per share:    
Weighted-average shares outstanding - basic 55,420 55,200
Net income per basic share $ 0.84 $ 0.97
Diluted net income per share:    
Weighted-average shares outstanding - basic 55,420 55,200
Diluted share equivalent: stock options, RSUs and PSUs 1,890 2,701
Weighted-average shares outstanding - diluted 57,310 57,901
Net income per diluted share $ 0.81 $ 0.92