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SELECTED FINANCIAL STATEMENT INFORMATION (Details Textuals) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2015
Apr. 30, 2014
Oct. 31, 2014
Business Acquisition [Line Items]          
Accrued customer rebates and credits $ 7.7hei_AccruedCustomerRebatesAndCredits   $ 7.7hei_AccruedCustomerRebatesAndCredits   $ 10.9hei_AccruedCustomerRebatesAndCredits
Total customer rebates and credits deducted within net sales $ 1.3hei_AccruedCustomerRebatesAndCreditsExpense $ 1.7hei_AccruedCustomerRebatesAndCreditsExpense $ 2.9hei_AccruedCustomerRebatesAndCreditsExpense $ 3.4hei_AccruedCustomerRebatesAndCreditsExpense  
Aeroworks [Member]          
Business Acquisition [Line Items]          
Percentage of Voting Interests Acquired 80.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= hei_AeroworksMember		   80.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= hei_AeroworksMember		    
Harter [Member]          
Business Acquisition [Line Items]          
Percentage of Voting Interests Acquired 80.10%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= hei_HarterMember		   80.10%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= hei_HarterMember