Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Basis Spread On Variable Rate, Floor

+ References

No definition available.

+ Details

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Namespace Prefix:	var_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Periodic Payment, Percentage

+ References

No definition available.

+ Details

Name:	var_DebtInstrumentPeriodicPaymentPercentage
Namespace Prefix:	var_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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- Details

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Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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Balance Type:
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- Details

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- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
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- Details

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- Details

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- Details

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- Details

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BORROWINGS - Existing Credit Agreement Narrative (Details) - Revolving Credit Facility May 2017 - USD ($)	May 01, 2017	Jul. 03, 2020	Jun. 10, 2020
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 100,000,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 200,000,000
Debt instrument, term	5 years
Available borrowing capacity		$ 100,000,000
Used capacity, commitment fee percentage	0.125%
Secured Debt
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 400,000,000
Debt instrument, term	5 years
London Interbank Offered Rate (LIBOR) \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
Federal Funds Effective Swap Rate \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
Minimum \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Unused capacity, commitment fee percentage	0.25%
Minimum \| London Interbank Offered Rate (LIBOR) \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate, floor	0.75%
Basis spread on variable rate	1.75%
Minimum \| Base Rate \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.75%
Maximum \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Unused capacity, commitment fee percentage	0.40%
Maximum \| London Interbank Offered Rate (LIBOR) \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	3.50%
Maximum \| Base Rate \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.50%
Debt Instrument, Repayment, Period One \| Secured Debt
Line of Credit Facility [Line Items]
Repayment percentage	5.00%
Debt Instrument, Repayment, Period Two \| Secured Debt
Line of Credit Facility [Line Items]
Repayment percentage	5.00%
Debt Instrument, Repayment, Period Three \| Secured Debt
Line of Credit Facility [Line Items]
Repayment percentage	7.50%
Debt Instrument, Repayment, Period Four \| Secured Debt
Line of Credit Facility [Line Items]
Repayment percentage	7.50%
Debt Instrument, Repayment, Period Five \| Secured Debt
Line of Credit Facility [Line Items]
Repayment percentage	10.00%