Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

+ Details

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=116868840&loc=d3e2207-128464

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_BusinessAcquisitionAxis=var_CancerTreatmentServicesInternationalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=var_EndocareandAliconMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=var_EmbolicsMicrospheresBusinessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_IntellectualPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelatedIntangibleAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TradeNamesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=var_PartnerRelationshipswithHospitalsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Business Combinations - Valuation of Intangible Assets Acquired (Details) - USD ($) $ in Millions	1 Months Ended
	Aug. 31, 2019	Jun. 28, 2019	Sep. 27, 2019
Cancer Treatment Services International
Business Acquisition [Line Items]
Tangible assets with finite lives			$ 111.8
In-process R&D with indefinite lives			0.0
Intangible assets			111.8
Endocare and Alicon
Business Acquisition [Line Items]
Tangible assets with finite lives			64.1
In-process R&D with indefinite lives			12.3
Intangible assets			76.4
Embolics Microspheres Business
Business Acquisition [Line Items]
Tangible assets with finite lives			37.8
In-process R&D with indefinite lives			0.0
Intangible assets			37.8
Technologies \| Cancer Treatment Services International
Business Acquisition [Line Items]
Tangible assets with finite lives			16.0
Weighted Average Estimated Useful Life (In Years)		7 years
Technologies \| Endocare and Alicon
Business Acquisition [Line Items]
Tangible assets with finite lives			58.8
Weighted Average Estimated Useful Life (In Years)		8 years 1 month 6 days
Technologies \| Embolics Microspheres Business
Business Acquisition [Line Items]
Tangible assets with finite lives			10.6
Weighted Average Estimated Useful Life (In Years)	12 years 6 months
Customer contracts, supplier relationships, and partner relationships \| Cancer Treatment Services International
Business Acquisition [Line Items]
Tangible assets with finite lives			50.9
Weighted Average Estimated Useful Life (In Years)		20 years 10 months 24 days
Customer contracts, supplier relationships, and partner relationships \| Endocare and Alicon
Business Acquisition [Line Items]
Tangible assets with finite lives			4.9
Weighted Average Estimated Useful Life (In Years)		8 years
Customer contracts, supplier relationships, and partner relationships \| Embolics Microspheres Business
Business Acquisition [Line Items]
Tangible assets with finite lives			20.9
Weighted Average Estimated Useful Life (In Years)	15 years 6 months
Trade Names \| Cancer Treatment Services International
Business Acquisition [Line Items]
Tangible assets with finite lives			44.9
Weighted Average Estimated Useful Life (In Years)		17 years 8 months 12 days
Trade Names \| Endocare and Alicon
Business Acquisition [Line Items]
Tangible assets with finite lives			0.4
Weighted Average Estimated Useful Life (In Years)		1 year
Trade Names \| Embolics Microspheres Business
Business Acquisition [Line Items]
Tangible assets with finite lives			$ 6.3
Weighted Average Estimated Useful Life (In Years)	17 years
Minimum \| Partner Relationships with Hospitals \| Cancer Treatment Services International
Business Acquisition [Line Items]
Weighted Average Estimated Useful Life (In Years)		22 years
Maximum \| Partner Relationships with Hospitals \| Cancer Treatment Services International
Business Acquisition [Line Items]
Weighted Average Estimated Useful Life (In Years)		23 years