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Retirement and Other Benefit Plans (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
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Defined Benefit Plan Before Adoption Of SFAS 158 Recognition Provision Accrued Benefit Liability | $ 0.6 | $ 0.7
DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear | $ 2.3 |

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- Definition Defined benefit plan before adoption of SFAS 158 recognition provision accrued benefit liability. + References No definition available. + Details
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Namespace Prefix: | ese_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanExpectedAmortizationNextFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant