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Schedule II - Valuation and Qualifying Accounts (Notes) | 12 Months Ended
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Dec. 28, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Valuation and Qualifying Accounts |
MASIMO CORPORATION VALUATION AND QUALIFYING ACCOUNTS Years ended December 28, 2019, December 29, 2018 and December 30, 2017 (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 28, 2019 |  |  |  |  |  |  |
| Allowance for doubtful accounts(1) | $ | 1,535 |  |  | $ | 1,021 |  |  | $ | (350 | ) |  | $ | 2,206 |
| Allowance for sales returns and allowances | 432 |  |  | 1,696 |  |  | (1,428 | ) |  | 700 |
Year ended December 29, 2018 |  |  |  |  |  |  |
| Allowance for doubtful accounts | 2,116 |  |  | (486 | ) |  | (95 | ) |  | 1,535 |
| Allowance for sales returns and allowances | 424 |  |  | 1,416 |  |  | (1,408 | ) |  | 432 |
Year ended December 30, 2017 |  |  |  |  |  |  |
| Allowance for doubtful accounts | 1,698 |  |  | 251 |  |  | 167 |  |  | 2,116 |
| Allowance for sales returns and allowances | 605 |  |  | 1,646 |  |  | (1,827 | ) |  | 424 |
______________ (1) In connection with its adoption of ASC 842 on December 30, 2018, the Company recorded allowance for credit loss for lease receivable which is included in the allowance for doubtful accounts for the year ended December 28, 2019. See “Recently Adopted Accounting Pronouncements” in Note 2 to these consolidated financial statements for additional information related to the Company’s adoption of ASC 842.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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