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Summary of Significant Accounting Policies - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Net income attributable to stockholders of Masimo Corporation:
Net income									$ 196,216	$ 193,543	$ 124,789
Basic net income per share:
Weighted-average shares outstanding - basic									53,434	52,296	51,516
Net income per basic share	$ 0.99	$ 0.92	$ 0.84	$ 0.93	$ 0.88	$ 1.09	$ 0.84	$ 0.88	$ 3.67	$ 3.70	$ 2.42
Diluted net income per share:
Weighted-average shares outstanding - basic									53,434	52,296	51,516
Diluted share equivalents: stock options and RSUs									3,666	3,743	4,358
Weighted-average shares outstanding - diluted									57,100	56,039	55,874
Net income per diluted share	$ 0.92	$ 0.86	$ 0.79	$ 0.87	$ 0.83	$ 1.02	$ 0.79	$ 0.82	$ 3.44	$ 3.45	$ 2.23

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