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Derivative Financial Instruments (Summary Of Notional Transaction Amounts And Fair Values) (Details) (Interest Rate Swap [Member], Forward-Starting [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2011
Interest Rate Swap [Member] | Forward-Starting [Member] |
Derivative [Line Items] |
Notional Amount | $ 60,000
Average interest rate payable | 1.10%
Average interest rate payable | 0.22%
Fair Value | $ (3)

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- Definition Interest rate swap, average interest rate payable. + Details
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Namespace Prefix: | ese
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Average fixed interest rate that will be received or paid upon exercise of a group of interest rate swaption contracts. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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. + Details
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Namespace Prefix: | us-gaap
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Period Type: | duration

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- Definition Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13495-108611 + Details
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Period Type: | instant

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- Definition Aggregate notional amount of all derivatives. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant