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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
 3 Months Ended 12 Months Ended
Jan. 02, 2021
Sep. 26, 2020
Jun. 27, 2020
Mar. 28, 2020
Dec. 28, 2019
Sep. 28, 2019
Jun. 29, 2019
Mar. 30, 2019
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
Net income attributable to stockholders of Masimo Corporation:                      
Net income including noncontrolling interest                 $ 240,282,000 $ 196,216,000 $ 193,543,000
Comprehensive loss attributable to noncontrolling interest                 (20,000) 0 0
Net Income (Loss) Attributable to Parent $ 70,669,000 $ 49,405,000 $ 55,772,000 $ 64,456,000 $ 52,921,000 $ 49,085,000 $ 44,888,000 $ 49,322,000 $ 240,302,000 $ 196,216,000 $ 193,543,000
Basic net income per share:                      
Weighted-average shares outstanding - basic                 54,700 53,434 52,296
Net income per basic share $ 1.28 $ 0.90 $ 1.02 $ 1.20 $ 0.99 $ 0.92 $ 0.84 $ 0.93 $ 4.39 $ 3.67 $ 3.70
Diluted net income per share:                      
Weighted-average shares outstanding - basic                 54,700 53,434 52,296
Diluted share equivalents: stock options and RSUs                 3,337 3,666 3,743
Weighted-average shares outstanding - diluted                 58,037 57,100 56,039
Net income per diluted share $ 1.21 $ 0.85 $ 0.96 $ 1.12 $ 0.92 $ 0.86 $ 0.79 $ 0.87 $ 4.14 $ 3.44 $ 3.45