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FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS, Level 3 valuation inputs (Details) (Fair Value, Inputs, Level 3 [Member])
12 Months Ended
Oct. 31, 2014
FY12 Acquisitions [Member]  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Fair Value Inputs, Discount Rate 3.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= hei_Fy12AcquisitionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
FY12 Acquisitions [Member] | Minimum [Member]  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Negative Long-term Revenue Growth Rate (8.00%)hei_NegativeLongtermRevenueGrowthRate
/ us-gaap_BusinessAcquisitionAxis
= hei_Fy12AcquisitionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
FY12 Acquisitions [Member] | Maximum [Member]  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Fair Value Inputs, Long-term Revenue Growth Rate 26.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_BusinessAcquisitionAxis
= hei_Fy12AcquisitionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
FY 2013 Acquisition [Member]  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Fair Value Inputs, Discount Rate 2.60%us-gaap_FairValueInputsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
FY 2013 Acquisition [Member] | Minimum [Member]  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Negative Long-term Revenue Growth Rate (7.00%)hei_NegativeLongtermRevenueGrowthRate
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
FY 2013 Acquisition [Member] | Maximum [Member]  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Fair Value Inputs, Long-term Revenue Growth Rate 20.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2013AcquisitionMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember