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SELECTED FINANCIAL STATEMENT INFORMATION (Details Textuals) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2012 | Apr. 30, 2011 | Apr. 30, 2012 | Apr. 30, 2011 | Oct. 31, 2011
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease) |  |  | $ 1.8 |  |
Accrued customer rebates and credits | 9.4 |  | 9.4 |  | 9.6
Total customer rebates and credits deducted within net sales | $ 0.7 | $ 1.8 | $ 1.1 | $ 4.4 |

X
- Definition Carrying value as of the balance sheet date of accrued customer rebates and credits. + References No definition available. + Details
Name: | hei_AccruedCustomerRebatesAndCredits
Namespace Prefix: | hei_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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

X
- Definition Amount of increase (decrease) in the allowance for doubtful accounts. + References No definition available. + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration