FAIR VALUE MEASUREMENTS (Details Textuals) $ in Thousands, $ in Thousands	Jan. 31, 2021 USD ($)	Jan. 31, 2021 CAD ($)	Oct. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities	$ 42,819		$ 41,974
FY2020 Acquisition Subsidiary 1 | Heico Electronic Technologies Corp
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities	10,200
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 21,100
Business Acquisition, Percentage of Voting Interests Acquired	89.99%	89.99%
FY2020 Acquisition Subsidiary 1 | Heico Electronic Technologies Corp | Canada, Dollars
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities		$ 13,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		27,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low		$ 13,500
FY2020 Acquisition Subsidiary 2 | Heico Electronic Technologies Corp
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities	$ 14,400
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 35,000
Business Acquisition, Percentage of Voting Interests Acquired	75.00%	75.00%
FY 2017 Acquisition [Member] | Heico Electronic Technologies Corp
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities	$ 18,300
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	20,000
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	$ 212,200		$ 178,300