Goodwill and Intangible Assets - Narrative (Details) $ in Millions	Mar. 31, 2024 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets, gross (excluding goodwill), fully amortized	$ 69.4

Intangible Assets, Gross (Excluding Goodwill), Fully Amortized

No definition available.

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