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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. 01, 2022
Oct. 02, 2021
Jul. 03, 2021
Apr. 03, 2021
Sep. 26, 2020
Jun. 27, 2020
Mar. 28, 2020
Jan. 01, 2022
Jan. 02, 2021
Dec. 28, 2019
Quarterly Financial Information Disclosure [Abstract]                    
Total revenue $ 327,578 $ 307,414 $ 305,118 $ 299,043 $ 278,112 $ 300,953 $ 269,625 $ 1,239,153 $ 1,143,744 $ 937,837
Gross profit 214,896 203,664 192,912 196,875 178,926 191,584 185,629 808,347 743,065 629,172
Operating income 77,411 67,611 65,136 65,664 59,698 62,220 69,010 $ 275,822 $ 255,823 $ 221,216
Net income $ 68,258 $ 57,771 $ 50,235 $ 53,375 $ 49,405 $ 55,772 $ 64,456      
Net income per share attributable to Masimo Corporation stockholders:                    
Basic $ 1.23 $ 1.05 $ 0.91 $ 0.97 $ 0.90 $ 1.02 $ 1.20 $ 4.16 $ 4.39 $ 3.67
Diluted $ 1.18 $ 1.00 $ 0.88 $ 0.92 $ 0.85 $ 0.96 $ 1.12 $ 3.98 $ 4.14 $ 3.44