SELECTED FINANCIAL STATEMENT INFORMATION (Details Textuals) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024	Oct. 31, 2024
Selected Financial Statement Information (Details) [Abstract]
Accrued customer rebates and credits	$ 29.4		$ 29.4		$ 24.3
Total customer rebates and credits deducted within net sales	$ 4.9	$ 2.7	$ 12.8	$ 8.5
SVM | Heico Electronic Technologies Corp
Business Combination [Line Items]
Business Combination, Voting Equity Interest Acquired, Percentage	70.00%		70.00%
SVM | Existing Management | Heico Electronic Technologies Corp
Business Combination [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	30.00%		30.00%
FY 2015 Acquisition | Flight Support Group [Member]
Business Combination [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	19.90%		19.90%
Noncontrolling Interest, Ownership Percentage by Parent	95.00%		95.00%
Millennium | HFSC
Business Combination [Line Items]
Business Combination, Voting Equity Interest Acquired, Percentage	90.00%		90.00%
Millennium | Existing Management | HFSC
Business Combination [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	10.00%		10.00%
2019 acquisition | Electronic Technologies Group [Member]
Business Combination [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	15.00%		15.00%
Noncontrolling Interest, Ownership Percentage by Parent	92.50%		92.50%
Rosen | Heico Electronic Technologies Corp
Business Combination [Line Items]
Business Combination, Voting Equity Interest Acquired, Percentage	100.00%		100.00%
ETG Pre-Acquistion | Electronic Technologies Group [Member]
Business Combination [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	87.90%		87.90%
FY 2006 Acquisition | Flight Support Group [Member]
Business Combination [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	19.90%		19.90%
Noncontrolling Interest, Ownership Percentage by Parent	85.10%		85.10%
ETG Subsidiary Post Rosen Acquisition | Electronic Technologies Group [Member]
Business Combination [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	92.40%		92.40%
FY2020 Acquisition Subsidiary 1 | Flight Support Group [Member]
Business Combination [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	90.00%		90.00%
Business Combination, Voting Equity Interest Sold, Percentage	10.00%		10.00%