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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		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Accounting Policies [Abstract]
Options to purchase of shares of common stock	400	600	300	1,100
Net income attributable to stockholders of Masimo Corporation:
Net income	$ 49,085	$ 57,126	$ 143,295	$ 146,609
Net income
Net income	$ 49,085	$ 57,126	$ 143,295	$ 146,609
Weighted-average shares outstanding - basic	53,535	52,432	53,367	52,046
Net income per basic share	$ 0.92	$ 1.09	$ 2.69	$ 2.82
Diluted net income per share:
Weighted-average shares outstanding - basic	53,535	52,432	53,367	52,046
Diluted share equivalent: stock options, RSUs and PSUs	3,727	3,805	3,688	3,829
Weighted-average shares outstanding - diluted	57,262	56,237	57,055	55,875
Net income per diluted share	$ 0.86	$ 1.02	$ 2.51	$ 2.62

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