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TAXES ON INCOME (LOSS) - Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 03, 2025	Sep. 27, 2024	Sep. 29, 2023
Deferred Tax Assets Valuation Allowance
Valuation allowance balance–beginning of fiscal year	$ 74.7	$ 18.7	$ 32.2
Other increases	4.7	56.0	0.0
Other decreases	0.0	0.0	(13.5)
Valuation allowance balance—end of fiscal year	$ 79.4	$ 74.7	$ 18.7

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

+ Details

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

X

- Definition

Deferred Tax Assets Valuation Allowance [Roll Forward]

+ References

No definition available.

+ Details

Name:	var_DeferredTaxAssetsValuationAllowanceRollForward
Namespace Prefix:	var_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Valuation Allowance, Deferred Tax Asset, Decrease, Amount

+ References

No definition available.

+ Details

Name:	var_ValuationAllowanceDeferredTaxAssetDecreaseAmount
Namespace Prefix:	var_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Valuation Allowance, Deferred Tax Asset, Increase, Amount

+ References

No definition available.

+ Details

Name:	var_ValuationAllowanceDeferredTaxAssetIncreaseAmount
Namespace Prefix:	var_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration