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GOODWILL AND OTHER INTANGIBLE ASSETS (Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jan. 31, 2015
Goodwill [Line Items]  
Balances as of October 31, 2014 $ 686,271us-gaap_Goodwill
Goodwill acquired 33,400us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency translation adjustments (6,918)us-gaap_GoodwillTranslationAdjustments
Balances as of January 31, 2015 712,753us-gaap_Goodwill
Flight Support Group [Member]  
Goodwill [Line Items]  
Balances as of October 31, 2014 282,407us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hei_FlightSupportGroupMember
Goodwill acquired 33,400us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= hei_FlightSupportGroupMember
Foreign currency translation adjustments (952)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= hei_FlightSupportGroupMember
Balances as of January 31, 2015 314,855us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hei_FlightSupportGroupMember
Electronic Technologies Group [Member]  
Goodwill [Line Items]  
Balances as of October 31, 2014 403,864us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember
Goodwill acquired 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember
Foreign currency translation adjustments (5,966)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember
Balances as of January 31, 2015 $ 397,898us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hei_ElectronicTechnologiesGroupMember