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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. 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
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 223,132	$ 210,583	$ 211,621	$ 212,953	$ 207,939	$ 193,360	$ 192,306	$ 196,643	$ 858,289	$ 790,248	$ 712,898
Gross profit	148,331	140,753	142,147	143,661	138,652	124,065	126,901	132,414	574,892	522,032	478,338
Operating income	53,906	48,641	51,612	53,885	44,726	43,061	43,849	52,151	$ 208,044	183,787	435,945
Net income	$ 46,934	$ 57,126	$ 43,853	$ 45,630	$ (7,735)	$ 35,853	$ 45,138	$ 51,533		$ 124,789	$ 311,097
Net income per share attributable to Masimo Corporation stockholders:
Basic	$ 0.88	$ 1.09	$ 0.84	$ 0.88	$ (0.15)	$ 0.69	$ 0.87	$ 1.02	$ 3.70	$ 2.42	$ 6.28

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