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EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS (Details 5) (FY 2013 Acquisition [Member], USD $)
In Thousands, unless otherwise specified
Oct. 31, 2014
FY 2013 Acquisition [Member]
 
Year ending October 31,  
2015 $ 921us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
2016 904us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
2017 897us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
2018 868us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
2019 895us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
2020-2024 $ 4,244us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember