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Variable Interest Entities (VIEs) - Condensed Consolidating Schedules of Statements of Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Oct. 01, 2016
Jul. 02, 2016
Apr. 02, 2016
Jan. 02, 2016
Oct. 03, 2015
Jul. 04, 2015
Apr. 04, 2015
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Statement of Comprehensive Income [Abstract]                      
Total revenue $ 183,201 $ 167,621 $ 172,636 $ 171,167 $ 167,273 $ 152,575 $ 155,726 $ 154,537 $ 694,625 $ 630,111 $ 586,643
Cost of goods sold                 230,826 220,128 195,864
Gross profit 124,329 110,122 115,135 114,213 101,745 102,232 102,901 103,105 463,799 409,983 390,779
Operating expenses:                      
Selling, general and administrative                 253,667 252,725 241,016
Research and development                 59,362 56,617 56,581
Litigation settlement, award and/or defense costs                 (270,000) (19,609) (10,331)
Total operating expenses                 43,029 289,733 287,266
Operating income 310,400 36,604 36,429 37,337 36,892 28,140 27,841 27,377 420,770 120,250 103,513
Non-operating expense                 2,429 3,905 1,472
Income before provision for income taxes                 418,341 116,345 102,041
Provision for income taxes                 117,675 34,845 27,678
Net income including noncontrolling interest                 300,666 81,500 74,363
Net income (loss) attributable to the noncontrolling interest                 0 (1,800) 1,845
Net income attributable to Masimo Corporation stockholders $ 215,293 $ 27,773 $ 30,023 $ 27,577 $ 24,101 $ 19,325 $ 19,351 $ 20,523 $ 300,666 83,300 72,518
Masimo Corp                      
Statement of Comprehensive Income [Abstract]                      
Total revenue                   630,111 586,643
Cost of goods sold                   226,788 201,334
Gross profit                   403,323 385,309
Operating expenses:                      
Selling, general and administrative                   250,627 238,674
Research and development                   50,292 53,449
Litigation settlement, award and/or defense costs                   (19,609) (8,010)
Total operating expenses                   281,310 284,113
Operating income                   122,013 101,196
Non-operating expense                   3,910 1,505
Income before provision for income taxes                   118,103 99,691
Provision for income taxes                   34,803 27,173
Net income including noncontrolling interest                   83,300 72,518
Net income attributable to Masimo Corporation stockholders                   83,300 72,518
Variable Interest Entity, Primary Beneficiary [Member]                      
Statement of Comprehensive Income [Abstract]                      
Total revenue                   6,910 5,970
Cost of goods sold                   0 0
Gross profit                   6,910 5,970
Operating expenses:                      
Selling, general and administrative                   2,348 2,842
Research and development                   6,325 3,132
Litigation settlement, award and/or defense costs                   0 (2,321)
Total operating expenses                   8,673 3,653
Operating income                   (1,763) 2,317
Non-operating expense                   (571) (33)
Income before provision for income taxes                   (1,192) 2,350
Provision for income taxes                   42 505
Net income including noncontrolling interest                   (1,234) 1,845
Net income attributable to Masimo Corporation stockholders                   (1,234) 1,845
Cercacor Elim                      
Statement of Comprehensive Income [Abstract]                      
Total revenue                   (6,910) (5,970)
Cost of goods sold                   (6,660) (5,470)
Gross profit                   (250) (500)
Operating expenses:                      
Selling, general and administrative                   (250) (500)
Total operating expenses                   (250) (500)
Non-operating expense                   566  
Income before provision for income taxes                   (566)  
Net income including noncontrolling interest                   (566)  
Net income (loss) attributable to the noncontrolling interest                   (1,800) 1,845
Net income attributable to Masimo Corporation stockholders                   $ 1,234 $ (1,845)