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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. 02, 2016
Jul. 04, 2015
Jul. 02, 2016
Jul. 04, 2015
Accounting Policies [Abstract]        
Options to purchase of shares of common stock 1,600 600 1,400 1,000
Net income attributable to stockholders of Masimo Corporation:        
Net income including noncontrolling interest $ 30,023 $ 18,696 $ 57,600 $ 38,518
Net loss attributable to the noncontrolling interest 0 655 0 1,356
Net income attributable to Masimo Corporation stockholders 30,023 19,351 57,600 39,874
Basic net income per share attributable to Masimo Corporation stockholders:        
Net income attributable to Masimo Corporation stockholders $ 30,023 $ 19,351 $ 57,600 $ 39,874
Weighted average shares outstanding - basic (in shares) 49,256 51,300 49,340 51,993
Basic net income per share attributable to Masimo Corporation stockholders (in usd per share) $ 0.61 $ 0.38 $ 1.17 $ 0.77
Diluted net income per share attributable to Masimo Corporation stockholders:        
Weighted average shares outstanding - basic (in shares) 49,256 51,300 49,340 51,993
Diluted share equivalent: stock options (in shares) 3,447 2,375 3,064 1,915
Weighted average shares outstanding - diluted (in shares) 52,703 53,675 52,404 53,908
Diluted net income per share attributable to Masimo Corporation stockholders (in usd per share) $ 0.57 $ 0.36 $ 1.10 $ 0.74