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Subsequent Event (Details) - Chief Executive Officer [Member] - Subsequent Event [Member] - USD ($) $ in Millions | Jan. 01, 2018 | Nov. 04, 2015
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Subsequent Event [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award |  | 2.7
Employment Agreement, Severance Benefits, Special Payment |  | $ 35.0
Employment Agreement, Severance Terms | 10.00% |
Employment Agreement, Severance Benefits, Special Payment, Qualifying Termination |  | $ 146.9

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- Definition Employment Agreement, Severance Benefits, Special Payment + References No definition available. + Details
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Namespace Prefix: | masi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Employment Agreement, Severance Benefits, Special Payment, Qualifying Termination + References No definition available. + Details
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Namespace Prefix: | masi_
Data Type: | xbrli:monetaryItemType
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- Definition Employment Agreement, Severance Terms + References No definition available. + Details
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- Definition Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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- Details
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