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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
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Apr. 02, 2016 | Apr. 04, 2015
Accounting Policies [Abstract] |  |
Options to purchase of shares of common stock | 1,500 | 3,200
Net income attributable to stockholders of Masimo Corporation: |  |
Net income including noncontrolling interest | $ 27,577 | $ 19,822
Net loss attributable to the noncontrolling interest | 0 | 701
Net income attributable to Masimo Corporation stockholders | 27,577 | 20,523
Basic net income per share attributable to Masimo Corporation stockholders: |  |
Net income attributable to Masimo Corporation stockholders | $ 27,577 | $ 20,523
Weighted average shares outstanding - basic (in shares) | 49,424 | 52,687
Basic net income per share attributable to Masimo Corporation stockholders (in usd per share) | $ 0.56 | $ 0.39
Diluted net income per share attributable to Masimo Corporation stockholders: |  |
Weighted average shares outstanding - basic (in shares) | 49,424 | 52,687
Diluted share equivalent: stock options (in shares) | 2,525 | 1,277
Weighted average shares outstanding - diluted (in shares) | 51,949 | 53,964
Diluted net income per share attributable to Masimo Corporation stockholders (in usd per share) | $ 0.53 | $ 0.38

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