The total fair value of stock options vested as of the balance sheet date.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Number of common shares reserved for future issuance related to deferred compensation arrangements with individuals.

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No definition available.

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Number of shares issued pursuant to the terms of a deferred compensation arrangement.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Number of options outstanding, including both vested and non-vested options.

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SHARE-BASED COMPENSATION (Details Textuals) (USD $)	12 Months Ended			1 Months Ended
SHARE-BASED COMPENSATION (Details Textuals) (USD $)	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012	Mar. 31, 2012	Oct. 31, 2011
Expired unissued shares (Shares Available For Grant)			(2,004,000)
Cancelled unissured shares (Shares Available For Grant)			(23,000)
Shares approved by Shareholders (Shares Available for Grant)			2,656,000
Number Outstanding (in shares)	3,264,000	3,142,000	2,899,000		2,893,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	1,617,000	1,840,000	2,389,000		2,083,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
Pre-tax unrecognized compensation expense related to nonvested stock options	$ 14,500,000
Pre-tax unrecognized compensation expense related to nonvested stock options, expected to be recognized over a weighted average period (in years)	3 years 9 months 4 days
Fair value of stock options, Vested	5,900,000hei_FairValueOfStockOptionsVested	4,500,000hei_FairValueOfStockOptionsVested	3,600,000hei_FairValueOfStockOptionsVested
Excess tax benefit from stock option exercises	93,000	5,126,000	12,110,000
Deferred Compensation Arrangement with Individual, Shares Issued	24,982
Deferred Compensation Arrangement with Individual, Common Stock Reserved for Future Issuance	62,455
Common Class A [Member]
Number Outstanding (in shares)	1,780,000
Stock Option and Future Grants [Member]
Shares approved by Shareholders (Shares Available for Grant)	4,900,000
Number Outstanding (in shares)	3,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	1,600,000
Restricted Stock [Member]
Allocated Share-based Compensation Expense	200,000	100,000
Income tax benefit related to Stock Options	700,000
Employee Stock Option [Member]
Allocated Share-based Compensation Expense	6,200,000	5,100,000	3,900,000
Income tax benefit related to Stock Options	$ 2,400,000	$ 2,000,000	$ 1,500,000
Non-Qualified Stock Option Plan [Member] [Member]
Expired unissued shares (Shares Available For Grant)				(100,000)
2002 Stock Option Plan [Member]
Expired unissued shares (Shares Available For Grant)				(2,000,000)
Restricted Subsidiary Shares [Member]
Equity Method Investment, Ownership Percentage	1.00%