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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textuals) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Apr. 30, 2017
Jan. 31, 2017
Apr. 30, 2016
Apr. 30, 2017
Apr. 30, 2016
Accounting Policies [Abstract]          
Common Stock Dividend Percentage Rate 25.00%     25.00%  
Stockholders' Equity Note, Stock Split       All applicable share and per share information has been adjusted retrospectively to give effect to the 5-for-4 stock split.  
New Accounting Pronouncement, Early Adoption [Line Items]          
Net income attributable to HEICO $ 45,686   $ 38,657 $ 86,613 $ 69,928
Weighted Average Number of Shares Outstanding, Diluted 86,637   85,035 86,520 84,980
New Accounting Pronouncement, Early Adoption, Effect [Member]          
New Accounting Pronouncement, Early Adoption [Line Items]          
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense   $ 3,100   $ 3,100  
Net income attributable to HEICO   $ 2,600      
Weighted Average Number of Shares Outstanding, Diluted 747     712