XML 61 R71.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Share-based compensation (Details) | Sep. 30, 2013 Equity and Incentive Plan (EIP) | May 11, 2010 Stock Option and Incentive Plan (SOIP) | Sep. 30, 2013 Nonemployee Director Stock Plan (2011 Director Plan)
--- | --- | --- | ---
Share-based compensation |  |  |
Shares remaining available for future issuance | 3,600,000 | 0 | 202,460
Shares that can be issued upon vesting of outstanding units and achievement of performance goals | 2,600,000 |  |

X
- Definition Represents the number of shares that could be issued upon vesting of share-based payment awards and achievement of performance goals. + References No definition available. + Details
Name: | he_ShareBasedCompensationNumberOfSharesThatCouldBeIssuedUponVestingAndAchievementOfPerformanceGoals
Namespace Prefix: | he_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of authorized but unissued shares that could be issued under the equity-based compensation plan. + References No definition available. + Details
Name: | he_ShareBasedCompensationNumberOfSharesThatCouldBeIssuedUponVestingOfRestrictedStockUnitsAndLongTermIncentivePlans
Namespace Prefix: | he_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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