FAIR VALUE MEASUREMENTS (Details Textuals) $ in Thousands, $ in Thousands	Jan. 31, 2022 USD ($)	Jan. 31, 2022 CAD ($)	Oct. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities	$ 61,853		$ 62,286
Aggregate LCP Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Related liabilities of deferred compensation plans, specified as other long-term liabilities	$ 240,500		$ 244,300
FY2021 Acquisition Subsidiary 1 | Heico Aerospace Corp
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	89.00%	89.00%
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low	$ 8,900
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	17,800
Total liabilities	$ 18,200
FY2020 Acquisition Subsidiary 1 | Heico Electronic Technologies Corp
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	89.99%	89.99%
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 21,200
Total liabilities	11,700
FY2020 Acquisition Subsidiary 1 | Heico Electronic Technologies Corp | Canada, Dollars
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low		$ 13,500
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		27,000
Total liabilities		$ 14,900
FY2020 Acquisition Subsidiary 2 | Heico Electronic Technologies Corp
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	35,000
Total liabilities	13,300
FY 2017 Acquisition [Member] | Heico Electronic Technologies Corp
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	20,000
Total liabilities	$ 18,600
Subsidiary | Heico Electronic Technologies Corp
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	75.00%	75.00%