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Quarterly Financial Data (unaudited) - Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 247,510	$ 229,011	$ 229,652	$ 231,664	$ 223,132	$ 210,583	$ 211,621	$ 212,953	$ 937,837	$ 858,289	$ 790,248
Gross profit	166,923	156,268	154,339	151,642	148,331	140,753	142,147	143,661	629,172	574,892	522,032
Operating income	61,557	51,632	52,004	56,023	53,906	48,641	51,612	53,885	$ 221,216	$ 208,044	$ 183,787
Net income	$ 52,921	$ 49,085	$ 44,888	$ 49,322	$ 46,934	$ 57,126	$ 43,853	$ 45,630
Net income per share attributable to Masimo Corporation stockholders:
Basic	$ 0.99	$ 0.92	$ 0.84	$ 0.93	$ 0.88	$ 1.09	$ 0.84	$ 0.88	$ 3.67	$ 3.70	$ 2.42
Diluted	$ 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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