XML 141 R125.htm IDEA: XBRL DOCUMENT
v3.20.4

Business Segment, Geographic Area, Product/Service Offerings and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Accounts receivable | $ 392.7 | $ 341.1
Inventory | 501.4 | 462.1
Total segment assets | 894.1 | 803.2
Operating Segments [Member] | Vacuum & Analysis [Member] |  |
Segment Reporting Information [Line Items] |  |
Accounts receivable | 229.1 | 185.9
Inventory | 273.3 | 224.8
Total segment assets | 502.4 | 410.7
Operating Segments [Member] | Light & Motion [Member] |  |
Segment Reporting Information [Line Items] |  |
Accounts receivable | 122.6 | 147.2
Inventory | 166.1 | 163.7
Total segment assets | 288.7 | 310.9
Operating Segments [Member] | Equipment & Solutions [Member] |  |
Segment Reporting Information [Line Items] |  |
Accounts receivable | 51.7 | 40.1
Inventory | 63.7 | 73.5
Total segment assets | 115.4 | 113.6
Corporate, Eliminations & Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Accounts receivable | (10.7) | (32.1)
Inventory | (1.7) | 0.1
Total segment assets | $ (12.4) | $ (32.0)

X
- Definition Segment assets. + References No definition available. + Details
Name: | mksi_SegmentAssets
Namespace Prefix: | mksi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4531-111522 + Details
Name: | us-gaap_AccountsReceivableNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_InventoryNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mksi_VacuumAndAnalysisSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mksi_LightAndMotionSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mksi_EquipmentAndSolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=mksi_CorporateReconcilingItemsAndEliminationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |