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FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS, Assets and liabilities and related impairment losses (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Schedule of Impairment Charges, Nonfinancial Assets and Liabilities [Line Items]      
Finite-Lived Intangible Assets, Net $ 146,181us-gaap_FiniteLivedIntangibleAssetsNet $ 184,568us-gaap_FiniteLivedIntangibleAssetsNet  
Indefinite-Lived Trade Names 54,629us-gaap_IndefiniteLivedTradeNames 56,990us-gaap_IndefiniteLivedTradeNames  
Impairment of Intangible Assets (Excluding Goodwill) (15,000)us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill 0us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill 0us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
Customer Relationships [Member]      
Schedule of Impairment Charges, Nonfinancial Assets and Liabilities [Line Items]      
Impairment of Intangible Assets, Finite-lived (11,200)us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		    
Finite-Lived Intangible Assets, Net 89,085us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 118,340us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		  
Intellectual Property [Member]      
Schedule of Impairment Charges, Nonfinancial Assets and Liabilities [Line Items]      
Impairment of Intangible Assets, Finite-lived (1,900)us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IntellectualPropertyMember		    
Finite-Lived Intangible Assets, Net 55,385us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IntellectualPropertyMember		 64,300us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IntellectualPropertyMember		  
Electronic Technologies Group [Member]      
Schedule of Impairment Charges, Nonfinancial Assets and Liabilities [Line Items]      
Impairment of Intangible Assets (Excluding Goodwill) (15,000)us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember		    
Electronic Technologies Group [Member] | Customer Relationships [Member]      
Schedule of Impairment Charges, Nonfinancial Assets and Liabilities [Line Items]      
Impairment of Intangible Assets, Finite-lived (11,200)us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember		    
Finite-Lived Intangible Assets, Net 19,366us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember		    
Electronic Technologies Group [Member] | Intellectual Property [Member]      
Schedule of Impairment Charges, Nonfinancial Assets and Liabilities [Line Items]      
Impairment of Intangible Assets, Finite-lived (1,900)us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IntellectualPropertyMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember		    
Finite-Lived Intangible Assets, Net 2,302us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IntellectualPropertyMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember		    
Trade Names [Member]      
Schedule of Impairment Charges, Nonfinancial Assets and Liabilities [Line Items]      
Impairment of Intangible Assets, Finite-lived (1,900)us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		    
Trade Names [Member] | Electronic Technologies Group [Member]      
Schedule of Impairment Charges, Nonfinancial Assets and Liabilities [Line Items]      
Indefinite Lived Intangible Assets, Carrying Amount 10,000hei_IndefiniteLivedIntangibleAssetsCarryingAmount
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember		    
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) (1,900)us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember		    
Fair Value, Inputs, Level 3 [Member] | Electronic Technologies Group [Member] | Customer Relationships [Member]      
Schedule of Impairment Charges, Nonfinancial Assets and Liabilities [Line Items]      
Finite-Lived Intangible Assets, Net 8,166us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember		    
Fair Value, Inputs, Level 3 [Member] | Electronic Technologies Group [Member] | Intellectual Property [Member]      
Schedule of Impairment Charges, Nonfinancial Assets and Liabilities [Line Items]      
Finite-Lived Intangible Assets, Net 402us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IntellectualPropertyMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember		    
Fair Value, Inputs, Level 3 [Member] | Trade Names [Member] | Electronic Technologies Group [Member]      
Schedule of Impairment Charges, Nonfinancial Assets and Liabilities [Line Items]      
Indefinite-Lived Trade Names $ 8,100us-gaap_IndefiniteLivedTradeNames
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember