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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. 03, 2021	Mar. 28, 2020
Net income attributable to stockholders of Masimo Corporation:
Net income	$ 53,383	$ 64,456
Basic net income per share:
Weighted-average shares outstanding - basic	55,200	53,867
Net income per basic share	$ 0.97	$ 1.20
Diluted net income per share:
Weighted-average shares outstanding - basic	55,200	53,867
Diluted share equivalent: stock options, RSUs and PSUs	2,701	3,718
Weighted-average shares outstanding - diluted	57,901	57,585
Net income per diluted share	$ 0.92	$ 1.12

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