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Schedule II - Valuation and Qualifying Accounts (Notes)
 12 Months Ended
Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
MASIMO CORPORATION
VALUATION AND QUALIFYING ACCOUNTS
Years ended December 30, 2017, December 31, 2016 and January 2, 2016
(in thousands)

Description
Balance at
beginning of period
 
Additions charged to
 expense and other accounts
 
Amounts charged
 against reserve
 
Balance at
end of period
Year ended December 30, 2017
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
1,698

 
$
251

 
$
167

 
$
2,116

 
Sales returns, allowance and reserves
605

 
1,593

 
(1,827
)
 
371

 
Valuation allowance on deferred tax asset
—

 
—

 
—

 
—

Year ended December 31, 2016
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
1,967

 
259

 
(528
)
 
1,698

 
Sales returns, allowance and reserves
710

 
2,320

 
(2,425
)
 
605

 
Valuation allowance on deferred tax asset
4,196

 
—

 
(4,196
)
 
—

Year ended January 2, 2016
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
1,890

 
342

 
(265
)
 
1,967

 
Sales returns, allowance and reserves
472

 
2,621

 
(2,383
)
 
710

 
Valuation allowance on deferred tax asset
3,365

 
831

 
—

 
4,196