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Revenue - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2024	Jun. 30, 2023
Revenue from Contract with Customer [Abstract]
Contract liabilities	$ 1.7	$ 0.8

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- References

No definition available.

+ Details

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

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- Definition

Contract Liabilities

+ References

No definition available.

+ Details

Name:	vsec_ContractLiabilities
Namespace Prefix:	vsec_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant