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COMMITMENTS AND CONTINGENCIES (Details Textuals) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Jul. 31, 2013
Loss Contingencies [Line Items] |
Standby letter of credit to meet the security requirement of its insurance company for potential workers'compensation claims | $ 1.5

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

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