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Business Segment Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Percentage Of Sale Of Customer Maximum | 10.00% | 10.00% | 10.00%
Capitalized Computer Software, Period Increase (Decrease) | $ 8.4 | $ 5.3 | $ 5.5

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- Definition The maximum sale percentage by a customer. + References No definition available. + Details
Name: | ese_PercentageOfSaleOfCustomerMaximum
Namespace Prefix: | ese_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Total increases or decreases in capitalized computer software costs for period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
Name: | us-gaap_CapitalizedComputerSoftwarePeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration