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Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Net Income Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Accounting Policies [Abstract]    
Options to purchase of shares of common stock 3,200,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 2,800,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Net income attributable to stockholders of Masimo Corporation:    
Net income including noncontrolling interest $ 19,822us-gaap_ProfitLoss $ 22,491us-gaap_ProfitLoss
Net loss attributable to the noncontrolling interest (701)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (141)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to Masimo Corporation stockholders 20,523us-gaap_NetIncomeLoss 22,632us-gaap_NetIncomeLoss
Basic net income per share attributable to Masimo Corporation stockholders:    
Net income attributable to Masimo Corporation stockholders $ 20,523us-gaap_NetIncomeLoss $ 22,632us-gaap_NetIncomeLoss
Weighted average shares outstanding - basic (in shares) 52,687,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 56,705,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic net income per share attributable to Masimo Corporation stockholders (in usd per share) $ 0.39us-gaap_EarningsPerShareBasic $ 0.40us-gaap_EarningsPerShareBasic
Diluted net income per share attributable to Masimo Corporation stockholders:    
Weighted average shares outstanding - basic (in shares) 52,687,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 56,705,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted share equivalent: stock options (in shares) 1,277,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1,342,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average shares outstanding - diluted (in shares) 53,964,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 58,047,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted net income per share attributable to Masimo Corporation stockholders (in usd per share) $ 0.38us-gaap_EarningsPerShareDiluted $ 0.39us-gaap_EarningsPerShareDiluted