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Commitments and Contingencies - Additional Information - (Detail)
 3 Months Ended 12 Months Ended
Feb. 15, 2022
USD ($)
Jan. 14, 2022
USD ($)
Jan. 01, 2022
USD ($)
Agreement
Customer
Jul. 08, 2019
USD ($)
Jul. 27, 2017
Jan. 03, 2014
USD ($)
Dec. 29, 2018
USD ($)
Jan. 01, 2022
USD ($)
Agreement
distributor
Customer
Jan. 02, 2021
USD ($)
distributor
Customer
Dec. 28, 2019
USD ($)
distributor
Contingencies And Commitments [Line Items]                    
Company contribution percentage based on employee contribution of up to 3% of employee's compensation               3.00%    
Company's contribution to employee retirement savings plan               $ 3,400,000 $ 3,200,000 $ 2,500,000
Severance plan participation agreements | Agreement     5         5    
Supplemental Unemployment Benefits, Severance Benefits, Required Notice of Resignation               6 months    
Purchase Commitment, Remaining Minimum Amount Committed     $ 5,000,000         $ 5,000,000    
License fee, Change in Control     2,500,000         2,500,000    
Royalty Guarantees, Commitments, Change in Control     15,000,000         15,000,000    
Royalty Guarantees, Commitments, Additional, Change in Control     2,000,000         2,000,000    
Remaining amount committed     170,200,000         170,200,000    
Commitments and contingencies              
Cash and cash equivalents     745,300,000         745,300,000    
Bank balance covered by Federal Deposit Insurance Corporation limit     $ 5,100,000         $ 5,100,000    
ConcentrationRiskARCustomer | Customer     1         1 1  
Royalty Agreement     1         1    
Royalty               $ 0 $ 0 $ 700,000
Loss Contingency, Damages Awarded, Value       $ 10,500,000            
Subsequent Event                    
Contingencies And Commitments [Line Items]                    
Long-term Purchase Commitment, Amount $ 1,025,000,000.000                  
Long-term Debt $ 800,000,000                  
Pulse oximetry products                    
Contingencies And Commitments [Line Items]                    
Percentage of Revenue - Customer Concentration               51.90% 49.30% 55.30%
Masimo vs Former Agency Tender                    
Contingencies And Commitments [Line Items]                    
Litigation awards, settlements/or defense costs             $ 10,500,000      
Proceeds from Legal Settlements                 $ 2,000,000  
Masimo vs. Physicians Healthsource, Inc.                    
Contingencies And Commitments [Line Items]                    
Loss Contingency, Damages Sought           $ 500        
Unsecured Bank Guarantees                    
Contingencies And Commitments [Line Items]                    
Commitments and contingencies     $ 3,500,000         $ 3,500,000    
Sales                    
Contingencies And Commitments [Line Items]                    
Number of just-in-time distributors | distributor               2 2 2
Accounts Receivable                    
Contingencies And Commitments [Line Items]                    
Number of just-in-time distributors | distributor               1 1  
Percentage of Accounts Receivable Balance     15.70%         15.70% 9.10%  
Just in time distributor one | Revenue Benchmark                    
Contingencies And Commitments [Line Items]                    
Percentage Of Revenue Two Customer               14.60% 10.10% 13.00%
Just in time distributor one | Accounts Receivable                    
Contingencies And Commitments [Line Items]                    
Percentage Of Accounts Receivable Balance From Three Just In Time Distributors     7.40%         7.40% 6.70%  
Just in time distributor two | Revenue Benchmark                    
Contingencies And Commitments [Line Items]                    
Percentage Of Revenue Two Customer               9.60% 11.50% 11.10%
Chief Executive Officer                    
Contingencies And Commitments [Line Items]                    
Employment Agreement, Severance Benefits, Special Payment, Qualifying Termination     $ 292,900,000              
Chief Executive Officer | Subsequent Event                    
Contingencies And Commitments [Line Items]                    
Employment Agreement, Severance Benefits, Special Payment, Qualifying Termination   $ 664,300,000                
Chief Executive Officer | Restricted Stock Units (RSUs)                    
Contingencies And Commitments [Line Items]                    
Employment Agreement, Severance Terms         50.00%          
Chief Executive Officer | Cash Distribution                    
Contingencies And Commitments [Line Items]                    
Employment Agreement, Severance Terms         50.00%