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Contingencies (Details) - Maximum [Member]	Apr. 30, 2018 USD ($)
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.

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No definition available.

+ Details

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- Definition

Self Insurance Retention

+ References

No definition available.

+ Details

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Namespace Prefix:	virc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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X

- Details

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Period Type:

X

- Details

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Namespace Prefix:
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X

- Details

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X

- Details

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