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Summary of Significant Accounting Policies - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Net income attributable to stockholders of Masimo Corporation:                      
Net income including noncontrolling interest                 $ 81,500 $ 74,363 $ 55,721
Net income (loss) attributable to the noncontrolling interest                 (1,800) 1,845 (2,660)
Basic net income per share attributable to Masimo Corporation stockholders:                      
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
Weighted-average shares outstanding                 51,311 54,708 56,690
Basic net income per share attributable to Masimo Corporation stockholders $ 0.48 $ 0.38 $ 0.38 $ 0.39 $ 0.40 $ 0.25 $ 0.40 $ 0.28 $ 1.62 $ 1.33 $ 1.03
Diluted net income per share attributable to Masimo Corporation stockholders:                      
Weighted-average shares outstanding                 51,311 54,708 56,690
Diluted share equivalents: stock options and RSUs                 2,396 863 790
Weighted-average shares outstanding - diluted                 53,707 55,571 57,480
Diluted net income per share attributable to Masimo Corporation stockholders $ 0.46 $ 0.36 $ 0.36 $ 0.38 $ 0.40 $ 0.24 $ 0.39 $ 0.27 $ 1.55 $ 1.30 $ 1.02