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Quarterly Financial Data (unaudited) - Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 02, 2016
Oct. 03, 2015
Jul. 04, 2015
Apr. 04, 2015
Jan. 03, 2015
Jun. 28, 2014
Mar. 29, 2014
Sep. 27, 2014
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Total revenue $ 167,273 $ 152,575 $ 155,726 $ 154,537 $ 161,788 $ 140,923 $ 139,814 $ 144,118 $ 630,111 $ 586,643 $ 547,245
Gross profit 101,745 102,232 102,901 103,105 109,159 93,095 92,301 96,224 409,983 390,779 358,827
Operating income 36,892 28,140 27,841 27,377 32,647 18,405 30,193 22,268 120,250 103,513 79,717
Net income attributable to Masimo Corporation stockholders $ 24,101 $ 19,325 $ 19,351 $ 20,523 $ 21,221,000 $ 13,802,000 $ 22,632,000 $ 14,863,000 $ 83,300 $ 72,518 $ 58,381
Net income per share attributable to Masimo Corporation stockholders:                      
Basic (in usd per share) $ 0.48 $ 0.38 $ 0.38 $ 0.39 $ 0.40 $ 0.25 $ 0.40 $ 0.28 $ 1.62 $ 1.33 $ 1.03
Diluted (in usd per share) $ 0.46 $ 0.36 $ 0.36 $ 0.38 $ 0.40 $ 0.24 $ 0.39 $ 0.27 $ 1.55 $ 1.30 $ 1.02