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OPERATING SEGMENTS (Details 1) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2015
Oct. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 1,580,594us-gaap_Assets $ 1,489,214us-gaap_Assets
Flight Support Group [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 779,920us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= hei_FlightSupportGroupMember		 676,824us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= hei_FlightSupportGroupMember
Electronic Technologies Group [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 679,534us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= hei_ElectronicTechnologiesGroupMember		 703,144us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= hei_ElectronicTechnologiesGroupMember
Other Primarily Corporate and Intersegment [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 121,140us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= hei_OtherPrimarilyCorporateAndInterSegmentMember		 $ 109,246us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= hei_OtherPrimarilyCorporateAndInterSegmentMember