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

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- 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