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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. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 183,201	$ 167,621	$ 172,636	$ 171,167	$ 167,273	$ 152,575	$ 155,726	$ 154,537	$ 694,625	$ 630,111	$ 586,643
Gross profit	124,329	110,122	115,135	114,213	101,745	102,232	102,901	103,105	463,799	409,983	390,779
Operating income	310,400	36,604	36,429	37,337	36,892	28,140	27,841	27,377	420,770	120,250	103,513
Net income attributable to Masimo Corporation stockholders	$ 215,293	$ 27,773	$ 30,023	$ 27,577	$ 24,101	$ 19,325	$ 19,351	$ 20,523	$ 300,666	$ 83,300	$ 72,518
Net income per share attributable to Masimo Corporation stockholders:
Basic (in usd per share)	$ 4.31	$ 0.56	$ 0.61	$ 0.56	$ 0.48	$ 0.38	$ 0.38	$ 0.39	$ 6.07	$ 1.62	$ 1.33
Diluted (in usd per share)	$ 3.97	$ 0.52	$ 0.57	$ 0.53	$ 0.46	$ 0.36	$ 0.36	$ 0.38	$ 5.65	$ 1.55	$ 1.30

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