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COMMITMENTS AND CONTINGENCIES (Details Textuals) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Apr. 30, 2012
Loss Contingencies [Line Items] |
Standby letter of credit to meet the security requirement of its insurance company for potential workers'compensation claims | $ 1.5
Business Acquisition Contingent Consideration Potential Cash Payment | 14.6
Contingent Purchase Consideration On Fifth Year [Member] |
Loss Contingencies [Line Items] |
Business Acquisition Contingent Consideration Potential Cash Payment | 74.0
Contingent Purchase Consideration On Fifth Year [Member] | Canadian Dollar [Member] |
Loss Contingencies [Line Items] |
Business Acquisition Contingent Consideration Potential Cash Payment | $ 73.0

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- Definition Standby letter of credit to meet the security requirement of its insurance company for potential workers' compensation claims. + References No definition available. + Details
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Namespace Prefix: | hei_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of potential cash payments that could result from the contingent consideration arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration