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ACQUISITIONS ACQUISITIONS (Details 2) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Nov. 22, 2011
Assets acquired:        
Goodwill $ 686,271us-gaap_Goodwill $ 688,489us-gaap_Goodwill $ 542,114us-gaap_Goodwill  
Switchcraft Inc [Member]        
Assets acquired:        
Goodwill       73,405us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hei_SwitchcraftIncMember
Identifiable intangible assets       72,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= hei_SwitchcraftIncMember
Inventories       13,086us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= hei_SwitchcraftIncMember
Property, plant and equipment       10,884us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= hei_SwitchcraftIncMember
Accounts receivable       6,123us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= hei_SwitchcraftIncMember
Other assets       1,358us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= hei_SwitchcraftIncMember
Total assets acquired, excluding cash       177,356us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= hei_SwitchcraftIncMember
Liabilities assumed:        
Deferred income taxes       30,244us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= hei_SwitchcraftIncMember
Accrued expenses       2,252hei_AccruedExpensesAssumed
/ us-gaap_BusinessAcquisitionAxis
= hei_SwitchcraftIncMember
Accounts payable       1,889us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= hei_SwitchcraftIncMember
Other liabilities       258us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= hei_SwitchcraftIncMember
Total liabilities assumed       34,643us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= hei_SwitchcraftIncMember
Net assets acquired, excluding cash       $ 142,713hei_IdentifiableassetsacquiredexcludingcashGoodwillandLiabilititesassumed
/ us-gaap_BusinessAcquisitionAxis
= hei_SwitchcraftIncMember