Derivative Financial Instruments - Interest rate swaps (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Interest rate swaps
Derivative Financial Instruments
Notional value of outstanding contracts	$ 177,300
Outstanding term of derivative instruments	3 years
Unrealized loss on derivative	$ 11,128	$ 2,284
Interest rate swap 2018
Derivative Financial Instruments
Fixed interest rate	2.85%
Percentage of coverage target retain	50.00%
Interest rate swap 2018 \| London Interbank Offered Rate L I B O R
Derivative Financial Instruments
Percentage of coverage on debt	50.00%
2016 interest rate swaps \| 1-month LIBOR
Derivative Financial Instruments
Blended weighted average rate	1.025%

Average fixed interest rate related to the group of interest rate derivatives.

No definition available.

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

+ Details

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Period Type:	instant

- Definition

Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeRemainingMaturity1
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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

+ Details

Name:	us-gaap_UnrealizedGainLossOnDerivatives
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Balance Type:	credit
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- Definition

The percentage of coverage on debt.

+ References

No definition available.

+ Details

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Namespace Prefix:	vrtu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of coverage target retain.

+ References

No definition available.

+ Details

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Namespace Prefix:	vrtu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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- Details

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- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
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- Details

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- Details

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