Carrying value as of the balance sheet date of accrued customer rebates and credits.

No definition available.

Name:	hei_AccruedCustomerRebatesAndCredits
Namespace Prefix:	hei_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The total customer rebates and credits expense deducted within net sales.

+ References

No definition available.

+ Details

Name:	hei_AccruedCustomerRebatesAndCreditsExpense
Namespace Prefix:	hei_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Selected Financial Statement Information (Details) [Abstract]

+ References

No definition available.

+ Details

Name:	hei_SelectedFinancialStatementInformationDetailsAbstract
Namespace Prefix:	hei_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=hei_FlightSupportGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=hei_FY2011AcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=hei_HeicoFlightSupportCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=hei_A2CMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SELECTED FINANCIAL STATEMENT INFORMATION (Details Textuals) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016	Oct. 31, 2016
Selected Financial Statement Information (Details) [Abstract]
Accrued customer rebates and credits	$ 12.6		$ 12.6		$ 11.9
Total customer rebates and credits deducted within net sales	$ 3.0	$ 2.9	$ 5.4	$ 5.2
Flight Support Group [Member] \| FY 2011 Acquisition [Member]
Business Acquisition [Line Items]
Percentage of Voting Interests Acquired	9.95%		9.95%
Ownership Percentage by Parent	80.10%		80.10%
Ownership Percentage by Noncontrolling Owners	19.90%		19.90%
Heico Flight Support Corp [Member] \| A2C [Member]
Business Acquisition [Line Items]
Percentage of Voting Interests Acquired	80.10%		80.10%
Ownership Percentage by Noncontrolling Owners	19.90%		19.90%
Heico Flight Support Corp [Member] \| Flight Support Group [Member] \| A2C [Member]
Business Acquisition [Line Items]
Percentage of Voting Interests Acquired	80.10%		80.10%