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Goodwill and Intangible Assets - Narrative (Details) $ in Millions	Sep. 30, 2024 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets, gross (excluding goodwill), fully amortized	$ 69.4

X

- References

No definition available.

+ Details

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

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- Definition

Intangible Assets, Gross (Excluding Goodwill), Fully Amortized

+ References

No definition available.

+ Details

Name:	vsec_IntangibleAssetsGrossExcludingGoodwillFullyAmortized
Namespace Prefix:	vsec_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant