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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. 30, 2017
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2016
Oct. 01, 2016
Jul. 02, 2016
Apr. 02, 2016
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Net income attributable to stockholders of Masimo Corporation:                      
Net income including noncontrolling interest                 $ 131,616 $ 300,666 $ 81,500
Net loss attributable to noncontrolling interest                 0 0 (1,800)
Basic net income per share attributable to Masimo Corporation stockholders:                      
Net income $ 367 $ 39,235 $ 46,680 $ 45,334 $ 215,293 $ 27,773 $ 30,023 $ 27,577 $ 131,616 $ 300,666 $ 83,300
Weighted-average shares outstanding                 51,516 49,530 51,311
Basic net income per share attributable to Masimo Corporation stockholders $ 0.01 $ 0.75 $ 0.90 $ 0.90 $ 4.31 $ 0.56 $ 0.61 $ 0.56 $ 2.55 $ 6.07 $ 1.62
Diluted net income per share attributable to Masimo Corporation stockholders:                      
Weighted-average shares outstanding                 51,516 49,530 51,311
Diluted share equivalents: stock options and RSUs                 4,358 3,665 2,396
Weighted-average shares outstanding - diluted                 55,874 53,195 53,707
Diluted net income per share attributable to Masimo Corporation stockholders $ 0.01 $ 0.70 $ 0.83 $ 0.82 $ 3.97 $ 0.52 $ 0.57 $ 0.53 $ 2.36 $ 5.65 $ 1.55