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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. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Options to purchase of shares of common stock									1,100	400	200
Net income attributable to stockholders of Masimo Corporation:
Net income including noncontrolling interest									$ 193,543	$ 124,789	$ 311,097
Basic net income per share:
Weighted-average shares outstanding - basic									52,296	51,516	49,530
Net income per basic share	$ 0.88	$ 1.09	$ 0.84	$ 0.88	$ (0.15)	$ 0.69	$ 0.87	$ 1.02	$ 3.70	$ 2.42	$ 6.28
Diluted net income per share:
Weighted-average shares outstanding - basic									52,296	51,516	49,530
Diluted share equivalents: stock options and RSUs									3,743	4,358	3,665
Weighted-average shares outstanding - diluted									56,039	55,874	53,195
Net income per diluted share	$ 0.83	$ 1.02	$ 0.79	$ 0.82	$ (0.15)	$ 0.64	$ 0.80	$ 0.93	$ 3.45	$ 2.23	$ 5.85

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