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EMPLOYEE RETIREMENT PLANS EMPLOYEE RETIREMENT PLANS (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Change in projected benefit obligation:    
Actuarial gain $ 900us-gaap_DefinedBenefitPlanActuarialGainLoss $ 1,000us-gaap_DefinedBenefitPlanActuarialGainLoss
FY 2013 Acquisition [Member]    
Change in projected benefit obligation:    
Projected benefit obligation, Opening balance 13,213us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
 
Acquired projected benefit obligation   14,539us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
Actuarial gain 930us-gaap_DefinedBenefitPlanActuarialGainLoss
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
(1,165)us-gaap_DefinedBenefitPlanActuarialGainLoss
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
Interest cost 610us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
236us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
Benefits paid (938)us-gaap_DefinedBenefitPlanBenefitsPaid
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
(397)us-gaap_DefinedBenefitPlanBenefitsPaid
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
Projected benefit obligation, Ending balance 13,815us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
13,213us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
Change in plan assets:    
Fair value of plan assets, Opening balance 11,397us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
 
Acquired plan assets   11,674us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
Actual return on plan assets 764us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
120us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
Employer contributions 136us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
 
Benefits paid (938)us-gaap_DefinedBenefitPlanBenefitsPaid
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
(397)us-gaap_DefinedBenefitPlanBenefitsPaid
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
Fair value of plan assets, Ending balance 11,359us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
11,397us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
Funded status $ 2,456us-gaap_DefinedBenefitPlanFundedStatusOfPlan
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
$ 1,816us-gaap_DefinedBenefitPlanFundedStatusOfPlan
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember