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Quarterly Financial Data (unaudited) - Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
Total revenue $ 295,054 $ 278,112 $ 300,953 $ 269,625 $ 247,510 $ 229,011 $ 229,652 $ 231,664 $ 1,143,744 $ 937,837 $ 858,289
Gross profit 186,926 178,926 191,584 185,629 166,923 156,268 154,339 151,642 743,065 629,172 574,892
Operating income 64,895 59,698 62,220 69,010 61,557 51,632 52,004 56,023 255,823 221,216 208,044
Net income $ 70,669 $ 49,405 $ 55,772 $ 64,456 $ 52,921 $ 49,085 $ 44,888 $ 49,322 $ 240,302 $ 196,216 $ 193,543
Net income per share attributable to Masimo Corporation stockholders:                      
Basic $ 1.28 $ 0.90 $ 1.02 $ 1.20 $ 0.99 $ 0.92 $ 0.84 $ 0.93 $ 4.39 $ 3.67 $ 3.70
Diluted $ 1.21 $ 0.85 $ 0.96 $ 1.12 $ 0.92 $ 0.86 $ 0.79 $ 0.87 $ 4.14 $ 3.44 $ 3.45