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REDEEMABLE NONCONTROLLING INTERESTS (Details Textuals) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2010
Dec. 31, 2012
Feb. 29, 2012
Oct. 31, 2011
Oct. 31, 2004
Oct. 31, 2006
Oct. 31, 2009
Oct. 31, 2005
Oct. 31, 2008
Business Acquisition [Line Items]                        
Management's estimate of the aggregate redemption amount of all put rights $ 39,966,000us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests $ 59,218,000us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests                    
Estimated Redemption Amount of equity interest redeemable at fair value 27,700,000us-gaap_RedeemableNoncontrollingInterestEquityCommonFairValue                      
Estimated Redemption Amount of equity interest redeemable based on a multiple of future earnings 12,300,000hei_RedeemableNoncontrollingInterestBasedOnMultipleOfEarnings                      
Payments For Repurchase Of Redeemable Noncontrolling Interest (1,243,000)us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest (16,610,000)us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest (7,616,000)us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest                  
Subsidiary One [Member] | Electronic Technologies Group [Member]                        
Business Acquisition [Line Items]                        
Percentage of interest acquired in the subsidiary               80.10%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiaryOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember
       
Subsidiary One [Member] | Flight Support Group [Member]                        
Business Acquisition [Line Items]                        
Percentage of interest acquired in the subsidiary                 80.10%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiaryOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_FlightSupportGroupMember
     
Subsidiary Two [Member] | Electronic Technologies Group [Member]                        
Business Acquisition [Line Items]                        
Percentage of interest acquired in the subsidiary                   82.50%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiaryTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember
   
Subsidiary Two [Member] | Flight Support Group [Member]                        
Business Acquisition [Line Items]                        
Percentage of interest acquired in the subsidiary             80.10%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiaryTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_FlightSupportGroupMember
         
Subsidiary Three [Member] | Electronic Technologies Group [Member]                        
Business Acquisition [Line Items]                        
Percentage of interest acquired in the subsidiary                     85.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiaryThreeMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember
 
Percentage of company total ownership interest 95.90%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiaryThreeMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember
                     
Subsidiary Three [Member] | Flight Support Group [Member]                        
Business Acquisition [Line Items]                        
Percentage of interest acquired in the subsidiary                       80.10%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiaryThreeMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_FlightSupportGroupMember
Percentage of company total ownership interest       82.30%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiaryThreeMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_FlightSupportGroupMember
               
Exercise of option by Noncontrolling interest holders       2.20%hei_BusinessAcquisitionPercentageOfVotingInterestsAcquiredFromMinority
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiaryThreeMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_FlightSupportGroupMember
               
Subsidiary Four [Member] | Flight Support Group [Member]                        
Business Acquisition [Line Items]                        
Percentage of interest acquired in the subsidiary                 51.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiaryFourMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_FlightSupportGroupMember
     
Exercise of option by Noncontrolling interest holders     20.00%hei_BusinessAcquisitionPercentageOfVotingInterestsAcquiredFromMinority
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiaryFourMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_FlightSupportGroupMember
  13.30%hei_BusinessAcquisitionPercentageOfVotingInterestsAcquiredFromMinority
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiaryFourMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_FlightSupportGroupMember
6.70%hei_BusinessAcquisitionPercentageOfVotingInterestsAcquiredFromMinority
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiaryFourMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_FlightSupportGroupMember
29.00%hei_BusinessAcquisitionPercentageOfVotingInterestsAcquiredFromMinority
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiaryFourMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_FlightSupportGroupMember
         
Subsidiary Five [Member] | Electronic Technologies Group [Member]                        
Business Acquisition [Line Items]                        
Management's estimate of the aggregate redemption amount of all put rights     $ 400,000us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiaryFiveMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember
                 
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     22.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiaryFiveMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember
                 
Subsidiary Five [Member] | Flight Support Group [Member]                        
Business Acquisition [Line Items]                        
Percentage of interest acquired in the subsidiary     84.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiaryFiveMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_FlightSupportGroupMember
                 
Subsidiary Six [Member]                        
Business Acquisition [Line Items]                        
Percentage of interest acquired in the subsidiary     80.10%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= hei_SubsidiarySixMember