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Related Party Disclosures (Details) - Mr. Deepak Munganahalli $ in Millions	8 Months Ended
	Dec. 31, 2021 USD ($)
Related Party Transaction [Line Items]
Defined Benefit Plan, Plan Assets, Related Party	$ 8.8
Defined Benefit Plan, Plan Liabilities, Related Party	$ 2.5

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- 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.

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No definition available.

+ Details

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

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- Definition

Defined Benefit Plan, Plan Assets, Administrative Expense, Related Party

+ References

No definition available.

+ Details

Name:	val_DefinedBenefitPlanPlanAssetsAdministrativeExpenseRelatedParty
Namespace Prefix:	val_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Defined Benefit Plan, Plan Liabilities, Related Party

+ References

No definition available.

+ Details

Name:	val_DefinedBenefitPlanPlanLiabilitiesRelatedParty
Namespace Prefix:	val_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=val_MrDeepakMunganahalliMember
Namespace Prefix:
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Balance Type:
Period Type: