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FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS (Level 3 Valuation Inputs) (Details) (Fair Value, Inputs, Level 3 [Member])
3 Months Ended
Jan. 31, 2015
FY 2015 Acquisition [Member]  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Fair Value Inputs, Discount Rate 2.20%us-gaap_FairValueInputsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2015AcquisitionMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
FY 2015 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_FY2015AcquisitionMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
FY 2015 Acquisition [Member] | Maximum [Member]  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Fair Value Inputs, Long-term Revenue Growth Rate 12.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_BusinessAcquisitionAxis
= hei_FY2015AcquisitionMember
/ 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