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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. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Net income attributable to stockholders of Masimo Corporation:
Net income	$ 55,772	$ 44,888	$ 120,228	$ 94,210
Basic net income per share:
Weighted-average shares outstanding - basic	54,764	53,356	54,316	53,283
Net income per basic share	$ 1.02	$ 0.84	$ 2.21	$ 1.77
Diluted net income per share:
Weighted-average shares outstanding - basic	54,764	53,356	54,316	53,283
Diluted share equivalent: stock options, RSUs and PSUs	3,440	3,710	3,597	3,657
Weighted-average shares outstanding - diluted	58,204	57,066	57,913	56,940
Net income per diluted share	$ 0.96	$ 0.79	$ 2.08	$ 1.65

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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