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v3.21.1

Contingencies (Details) - Maximum | Apr. 30, 2021 USD ($)
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Loss Liability [Member] |
Loss Contingencies [Line Items] |
Self insurance retention | $ 30,000,000
Automobile Liability Loss [Member] |
Loss Contingencies [Line Items] |
Self insurance retention | 50,000
Workers compensation Liability Insurance [Member] |
Loss Contingencies [Line Items] |
Self insurance retention | 250,000
Product and General Liability Insurance [Member] |
Loss Contingencies [Line Items] |
Self insurance retention | $ 250,000

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Self Insurance Retention + References No definition available. + Details
Name: | virc_SelfInsuranceRetention
Namespace Prefix: | virc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=virc_LossLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=virc_AutomobileLiabilityLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=virc_WorkerscompensationLiabilityInsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=virc_ProductandGeneralLiabilityInsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |