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Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Accounting Policies [Abstract]        
Options to purchase of shares of common stock 100 1,600 100 1,400
Net income attributable to stockholders of Masimo Corporation:        
Net income $ 46,680 $ 30,023 $ 92,014 $ 57,600
Net income attributable to Masimo Corporation stockholders 46,680 30,023 92,014 57,600
Net income        
Net income attributable to Masimo Corporation stockholders $ 46,680 $ 30,023 $ 92,014 $ 57,600
Weighted average shares outstanding - basic (in shares) 51,677 49,256 51,164 49,340
Basic net income per share attributable to Masimo Corporation stockholders (in usd per share) $ 0.90 $ 0.61 $ 1.80 $ 1.17
Diluted net income per share:        
Weighted average shares outstanding - basic (in shares) 51,677 49,256 51,164 49,340
Diluted share equivalent: stock options (in shares) 4,496 3,447 4,703 3,064
Weighted average shares outstanding - diluted (in shares) 56,173 52,703 55,867 52,404
Diluted net income per share attributable to Masimo Corporation stockholders (in usd per share) $ 0.83 $ 0.57 $ 1.65 $ 1.10