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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. 28, 2020	Mar. 30, 2019
Net income attributable to stockholders of Masimo Corporation:
Net income	$ 64,456	$ 49,322
Basic net income per share:
Weighted-average shares outstanding - basic	53,867	53,210
Net income per basic share	$ 1.20	$ 0.93
Diluted net income per share:
Weighted-average shares outstanding - basic	53,867	53,210
Diluted share equivalent: stock options, RSUs and PSUs	3,718	3,589
Weighted-average shares outstanding - diluted	57,585	56,799
Net income per diluted share	$ 1.12	$ 0.87

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