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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 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
Net income attributable to stockholders of Masimo Corporation:                      
Net income including noncontrolling interest                 $ 300,666 $ 81,500 $ 74,363
Net income (loss) attributable to the noncontrolling interest                 0 (1,800) 1,845
Basic net income per share attributable to Masimo Corporation stockholders:                      
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
Weighted-average shares outstanding                 49,530 51,311 54,708
Basic net income per share attributable to Masimo Corporation stockholders $ 4.31 $ 0.56 $ 0.61 $ 0.56 $ 0.48 $ 0.38 $ 0.38 $ 0.39 $ 6.07 $ 1.62 $ 1.33
Diluted net income per share attributable to Masimo Corporation stockholders:                      
Weighted-average shares outstanding                 49,530 51,311 54,708
Diluted share equivalents: stock options and RSUs                 3,665 2,396 863
Weighted-average shares outstanding - diluted                 53,195 53,707 55,571
Diluted net income per share attributable to Masimo Corporation stockholders $ 3.97 $ 0.52 $ 0.57 $ 0.53 $ 0.46 $ 0.36 $ 0.36 $ 0.38 $ 5.65 $ 1.55 $ 1.30