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CONSOLIDATED STATEMENTS OF OPERATIONS Statement - USD ($) shares in Thousands, $ 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
Income Statement [Abstract]
Product									$ 663,846	$ 599,334	$ 556,764
Royalty									30,779	30,777	29,879
Total revenue	$ 183,201	$ 167,621	$ 172,636	$ 171,167	$ 167,273	$ 152,575	$ 155,726	$ 154,537	694,625	630,111	586,643
Cost of goods sold									230,826	220,128	195,864
Gross profit	124,329	110,122	115,135	114,213	101,745	102,232	102,901	103,105	463,799	409,983	390,779
Selling, general and administrative									253,667	252,725	241,016
Research and development									59,362	56,617	56,581
Litigation settlement, award and/or defense costs									(270,000)	(19,609)	(10,331)
Total operating expenses									43,029	289,733	287,266
Operating income	310,400	36,604	36,429	37,337	36,892	28,140	27,841	27,377	420,770	120,250	103,513
Non-operating expense									(2,429)	(3,905)	(1,472)
Income before provision for income taxes									418,341	116,345	102,041
Provision for income taxes									117,675	34,845	27,678
Net income including noncontrolling interest									300,666	81,500	74,363
Net income (loss) attributable to the noncontrolling interest									0	(1,800)	1,845
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
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
Basic (shares)									49,530	51,311	54,708
Diluted (shares)									53,195	53,707	55,571

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