Lines of Credit (Details) $ in Thousands	12 Months Ended
Jul. 31, 2018 USD ($) Arrangement	Jul. 31, 2017 USD ($)
Unsecured lines of credit [Abstract]
Outstanding cash advances, recorded as lines of credit on the accompanying consolidated balance sheets	$ 0	$ 372
Short-term loan issued under lines of credit included in current portion of long-term debt	0	200
Outstanding letters of credit to support operations	1,668	2,193
Total amounts used under lines of credit	1,668	2,765
Remaining amounts available under lines of credit	33,932	35,735
Total unsecured lines of credit	$ 35,600	38,500
U.S. [Member]
Unsecured lines of credit [Abstract]
Number of line of credit arrangements \| Arrangement	2
U.S. [Member] \| U.S. Operations Credit Arrangement One [Member]
Unsecured lines of credit [Abstract]
Outstanding cash advances, recorded as lines of credit on the accompanying consolidated balance sheets	$ 0	0
Total unsecured lines of credit	$ 19,000
U.S. [Member] \| U.S. Operations Credit Arrangement One [Member] \| LIBOR [Member]
Unsecured lines of credit [Abstract]
Basis spread on variable rate	2.75%
U.S. [Member] \| U.S. Operations Credit Arrangement Two [Member]
Unsecured lines of credit [Abstract]
Outstanding cash advances, recorded as lines of credit on the accompanying consolidated balance sheets	$ 0	0
Total unsecured lines of credit	$ 13,500
U.S. [Member] \| U.S. Operations Credit Arrangement Two [Member] \| LIBOR [Member]
Unsecured lines of credit [Abstract]
Basis spread on variable rate	2.00%
South America [Member]
Unsecured lines of credit [Abstract]
Number of line of credit arrangements \| Arrangement	2
South America [Member] \| South American Operations Credit Arrangement One [Member]
Unsecured lines of credit [Abstract]
Outstanding cash advances, recorded as lines of credit on the accompanying consolidated balance sheets	$ 0	0
Outstanding letters of credit to support operations	1,000	1,600
Total unsecured lines of credit	2,000
South America [Member] \| South American Operations Credit Arrangement Two [Member]
Unsecured lines of credit [Abstract]
Outstanding letters of credit to support operations	600	500
Total unsecured lines of credit	1,100
Outstanding cash advances and short-term loan	0	600
Maximum [Member] \| U.S. [Member] \| U.S. Operations Credit Arrangement One [Member]
Unsecured lines of credit [Abstract]
Outstanding letters of credit to support operations	100	100
Maximum [Member] \| U.S. [Member] \| U.S. Operations Credit Arrangement Two [Member]
Unsecured lines of credit [Abstract]
Outstanding letters of credit to support operations	$ 100	$ 100

Number of credit arrangements under line of credit.

No definition available.

Name:	eei_NumberOfLineOfCreditArrangements
Namespace Prefix:	eei_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of outstanding cash advances and short-term loan.

+ References

No definition available.

+ Details

Name:	eei_OutstandingCashAdvancesAndShortTermLoan
Namespace Prefix:	eei_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Refers to amount of borrowings from a bank classified as term loan, maturing within one year or operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	eei_ShortTermLoansIssuedUnderLinesOfCreditIncludedInCurrentPortionOfLongTermDebt
Namespace Prefix:	eei_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	eei_UnsecuredLineOfCreditAbstract
Namespace Prefix:	eei_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowings from a bank classified as other, maturing within one year or operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_ShortTermBankLoansAndNotesPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	srt_StatementGeographicalAxis=country_US
Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
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- Details

Name:	srt_StatementGeographicalAxis=srt_SouthAmericaMember
Namespace Prefix:
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- Details

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- Details

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- Details

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Namespace Prefix:
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