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DEBT (Narrative) (Details) (USD $)	0 Months Ended	9 Months Ended
	May 14, 2012	Jun. 30, 2013	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2011
Debt Instrument [Line Items]
Revolving credit facility		$ 330,000,000
Available to borrow under the credit facility		251,000,000
Option amount to increase credit facility		250,000,000
Cash on hand		31,647,000	30,215,000	32,157,000	34,158,000
Outstanding borrowings under the credit facility		187,000,000
Outstanding letters of credit		12,500,000
Number of lenders	8
Percentage of foreign subsidiaries' share equity		65.00%
Minimum [Member]
Debt Instrument [Line Items]
Incremental term loan		25,000,000
Credit facility fees		17.50%
Maximum [Member]
Debt Instrument [Line Items]
Incremental term loan		250,000,000
Credit facility fees		35.00%
Aclara Technologies Llc [Member]
Debt Instrument [Line Items]
Outstanding letters of credit		4,200,000
JPMorgan Chase Bank N.A. [Member]
Debt Instrument [Line Items]
Revolving credit facility	$ 450,000,000
Revolving credit facility period	5 years

X

- Definition

Facility secured by pledge of the material foreign subsidiaries' share equity.

+ References

No definition available.

+ Details

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X

- Definition

Line of credit facility, incremental term loan.

+ References

No definition available.

+ Details

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Namespace Prefix:	ese_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Line of credit facility, number of lenders.

+ References

No definition available.

+ Details

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Namespace Prefix:	ese_
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X

- Definition

Line of credit facility, period of facility, years.

+ References

No definition available.

+ Details

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Namespace Prefix:	ese_
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X

- Definition

Option To Increase Credit Facility

+ References

No definition available.

+ Details

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Namespace Prefix:	ese_
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Balance Type:	credit
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X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Name Accounting Standards Codification

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-Name Accounting Standards Codification

-Topic 230

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-Section 45

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-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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X

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section S99

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-Name Regulation S-X (SX)

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X

- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

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