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Debt (Narrative) (Details) (USD $)
3 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
May 14, 2012
Debt Instrument [Line Items]          
Available to borrow under the credit facility $ 379,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity        
Cash on hand 38,609,000us-gaap_CashAndCashEquivalentsAtCarryingValue 35,131,000us-gaap_CashAndCashEquivalentsAtCarryingValue 34,367,000us-gaap_CashAndCashEquivalentsAtCarryingValue 42,850,000us-gaap_CashAndCashEquivalentsAtCarryingValue  
Percentage of foreign subsidiaries' share equity 65.00%ese_FacilitySecuredByPledgeOfMaterialForeignSubsidiariesShareEquity        
Letters of Credit Outstanding, Amount 11,400,000us-gaap_LettersOfCreditOutstandingAmount        
Line of Credit Facility, Amount Outstanding 60,000,000us-gaap_LineOfCredit        
Minimum [Member]          
Debt Instrument [Line Items]          
Incremental term loan         25,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Credit facility fees 17.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Maximum [Member]          
Debt Instrument [Line Items]          
Incremental term loan 250,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
      250,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Credit facility fees 35.00%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
JPMorgan Chase Bank N.A. [Member]          
Debt Instrument [Line Items]          
Revolving credit facility         450,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= ese_JpmorganChaseBankNMember
Line Of Credit Facility Additional Borrowing Capacity $ 250,000,000ese_LineOfCreditFacilityAdditionalBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= ese_JpmorganChaseBankNMember