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Accounts Receivable (Schedule of Costs, Estimated Earnings and Billings on Percentage of Completion Contracts) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Jun. 30, 2016
--- | --- | ---
Receivables [Abstract] |  |
Costs incurred on uncompleted contracts | $ 20,088 |
Estimated earnings | 6,031 |
Less: billings to date | (28,179) |
Ending balance | $ (2,060) |

X
- Definition Billings to date on uncompleted contracts. + References No definition available. + Details
Name: | evi_BillingsToDate
Namespace Prefix: | evi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Costs and estimated earnings in excess of billings, net of billings in excess of costs on uncompleted contracts. + References No definition available. + Details
Name: | evi_CostsAndEstimatedEarningsInExcessOfBillingsOnUncompletedContractsNet
Namespace Prefix: | evi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Costs incurred on uncompleted contracts. + References No definition available. + Details
Name: | evi_CostsIncurredOnUncompletedContracts
Namespace Prefix: | evi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Estimated earnings. + References No definition available. + Details
Name: | evi_EstimatedEarnings
Namespace Prefix: | evi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration