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Quarterly Financial Data (unaudited) - Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
Total revenue $ 225,181 $ 193,692 $ 192,933 $ 186,302 $ 183,201 $ 167,621 $ 172,636 $ 171,167 $ 798,108 $ 694,625 $ 630,111
Gross profit 153,864 128,665 128,437 124,134 124,329 110,122 115,135 114,213 535,100 463,799 409,983
Operating income 59,323 47,975 46,868 43,195 310,400 36,604 36,429 37,337 197,361 420,770 120,250
Net income $ 367 $ 39,235 $ 46,680 $ 45,334 $ 215,293 $ 27,773 $ 30,023 $ 27,577 $ 131,616 $ 300,666 $ 83,300
Net income per share attributable to Masimo Corporation stockholders:                      
Basic $ 0.01 $ 0.75 $ 0.90 $ 0.90 $ 4.31 $ 0.56 $ 0.61 $ 0.56 $ 2.55 $ 6.07 $ 1.62
Diluted $ 0.01 $ 0.70 $ 0.83 $ 0.82 $ 3.97 $ 0.52 $ 0.57 $ 0.53 $ 2.36 $ 5.65 $ 1.55