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FAIR VALUE MEASUREMENTS
 6 Months Ended
Apr. 30, 2026
Fair Value Disclosures [Abstract]  
Fair Value Disclosures [Text Block] FAIR VALUE MEASUREMENTS
The Company's assets and liabilities that were measured at fair value on a recurring basis are set forth by level within the fair value hierarchy in the following tables (in thousands):
As of April 30, 2026
Quoted Prices
in Active Markets for Identical Assets (Level 1)		Significant
Other Observable Inputs
(Level 2)		Significant Unobservable Inputs
(Level 3)		Total
Assets:
Deferred compensation plan:
Corporate-owned life insurance$— $391,517 $— $391,517 
Money market fund7,627 — — 7,627 
Total assets$7,627 $391,517 $— $399,144 
Liabilities:
Contingent consideration $— $— $53,395 $53,395 
As of October 31, 2025
Quoted Prices
in Active Markets for Identical Assets (Level 1)		Significant
Other Observable Inputs
(Level 2)		Significant Unobservable Inputs
(Level 3)		Total
Assets:
Deferred compensation plan:
Corporate-owned life insurance$— $378,930 $— $378,930 
Money market fund11,940 — — 11,940 
Total assets$11,940 $378,930 $— $390,870 
Liabilities:
Contingent consideration$— $— $46,198 $46,198 

The Company maintains the HEICO Corporation Leadership Compensation Plan (the "LCP"), which is a non-qualified deferred compensation plan. The assets of the LCP principally represent cash surrender values of life insurance policies, which derive their fair values from investments in mutual funds that are managed by an insurance company, and are classified within Level 2 and valued using a market approach. Certain other assets of the LCP represent an investment in a money market fund that is classified within Level 1. The assets of the LCP are held within an irrevocable trust and classified within other assets in the Company’s Condensed
Consolidated Balance Sheets. The related liabilities of the LCP are included within other long-term liabilities and accrued expenses and other current liabilities in the Company’s Condensed Consolidated Balance Sheets and have an aggregate value of $390.7 million as of April 30, 2026 and $385.7 million as of October 31, 2025.

As part of the agreement to acquire 90% of the stock of a subsidiary by the ETG in fiscal 2026, the Company may be obligated to pay contingent consideration of up to $4.1 million in fiscal 2030 based on the earnings of the acquired entity during fiscal years 2028 and 2029. As of April 30, 2026, the estimated fair value of the contingent consideration was $2.7 million.

As part of the agreement to acquire 90% of the membership interests of a subsidiary by the FSG in fiscal 2025, the Company may be obligated to pay contingent consideration of up to $21.1 million in fiscal 2028 based on the earnings of the acquired entity during the three-year period following the acquisition provided the entity meets a certain earnings objective over the same three-year period. As of April 30, 2026, the estimated fair value of the contingent consideration was $14.7 million.

As part of the agreement to acquire 96% of the stock of a subsidiary by the FSG in fiscal 2022, the Company may be obligated to pay contingent consideration of up to $27.4 million in fiscal 2027 based on the earnings of the acquired entity during fiscal years 2025 and 2026. As of April 30, 2026, the estimated fair value of the contingent consideration was $22.9 million.

As part of the agreement to acquire 74% of the membership interests of a subsidiary by the FSG in fiscal 2022, the Company may be obligated to pay contingent consideration of $14.1 million in fiscal 2027 should the acquired entity meet a certain earnings objective during the five-year period following the acquisition. As of April 30, 2026, the estimated fair value of the contingent consideration was $13.2 million.

The estimated fair values of the contingent consideration arrangements described above are classified within Level 3 and were determined using a probability-based scenario analysis approach. Under this method, a set of discrete potential future subsidiary earnings was determined using internal estimates based on various revenue growth rate assumptions for each scenario. A probability of likelihood was assigned to each discrete potential future earnings estimate and the resultant contingent consideration was calculated. The resulting probability-weighted contingent consideration amounts were discounted using a weighted average discount rate reflecting the credit risk of a market participant.
The following unobservable inputs were used to derive the estimated fair value of the Company's Level 3 contingent consideration liabilities as of April 30, 2026:
AcquisitionFair ValueUnobservableWeighted
Date(in thousands)InputRange
Average (1)
4-8-2026$2,699Compound annual revenue growth rate
0% - 10%
7%
Discount rate
8.0% - 8.0%
8.0%
1-31-202514,650Compound annual revenue growth rate
(1%) - 19%
10%
Discount rate
6.5% - 6.5%
6.5%
7-18-202222,861Compound annual revenue growth rate
5% - 9%
7%
Discount rate
7.0% - 7.0%
7.0%
3-17-202213,185Compound annual revenue growth rate
(4%) - 11%
8%
Discount rate
7.0% - 7.0%
7.0%
(1)    Unobservable inputs were weighted by the relative fair value of the contingent consideration liability.

Changes in the Company’s contingent consideration liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) for the six months ended April 30, 2026 are as follows (in thousands):
Liabilities
Balance as of October 31, 2025$46,198 
Increase in accrued contingent consideration4,502 
Contingent consideration related to an acquisition2,695 
Balance as of April 30, 2026$53,395 
Included in the accompanying Condensed Consolidated Balance Sheet
 under the following captions:
Accrued expenses and other current liabilities$22,861 
Other long-term liabilities30,534 
$53,395 

The Company records changes in accrued contingent consideration within SG&A expenses in its Condensed Consolidated Statements of Operations.

The carrying amounts of the Company’s cash and cash equivalents, accounts receivable, trade accounts payable and accrued expenses and other current liabilities approximate fair value as of April 30, 2026 due to the relatively short maturity of the respective instruments. The
carrying amount of borrowings under the Company's Credit Facility approximates fair value due to its variable interest rate. See Note 5, Long-Term Debt, for the estimated fair value of the Company’s senior unsecured notes.