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v3.23.3

Revenue - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Revenue from Contract with Customer [Abstract] |  |
Contract liabilities | $ 0.9 | $ 0.5

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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