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Credit agreement and long-term debt (Details) | May. 05, 2014 USD ($) | May. 02, 2014 USD ($) | Apr. 02, 2014 USD ($) Institution | Mar. 31, 2015 | Mar. 31, 2014 USD ($)
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Credit agreement |  |  |  |  |
Number of financial institutions | Institution |  |  | 9 |  |
Actual capitalization ratio (as a percent) |  |  |  | 14.00% |
Ratio of consolidated subsidiary debt to total consolidated capitalization required to be maintained as per the debt covenant (as a percent) |  |  | 65.00% |  |
Ratio of consolidated capitalization required to be maintained as per the debt covenant (as a percent) |  |  | 35.00% |  |
Actual ratio of consolidated debt to total consolidated capitalization (as a percent) |  |  |  | 57.00% |
Maximum |  |  |  |  |
Credit agreement |  |  |  |  |
Capitalization ratio required to be maintained as per the debt covenant (as a percent) |  |  | 50.00% |  |
HELCO |  |  |  |  |
Credit agreement |  |  |  |  |
Actual ratio of consolidated subsidiary debt to total consolidated capitalization (as a percent) |  |  |  | 41.00% |
Maui Electric |  |  |  |  |
Credit agreement |  |  |  |  |
Actual ratio of consolidated subsidiary debt to total consolidated capitalization (as a percent) |  |  |  | 42.00% |
Line of credit facility |  |  |  |  |
Credit agreement |  |  |  |  |
Revolving noncollateralized credit facility with a letter of credit sub-facility |  |  | $ 150,000,000 |  | $ 125,000,000
Unused capacity commitment fee |  |  | 0.20% |  |
Line of credit facility | Hawaiian Electric Company |  |  |  |  |
Credit agreement |  |  |  |  |
Revolving noncollateralized credit facility with a letter of credit sub-facility |  |  | $ 200,000,000 |  | $ 175,000,000
Unused capacity commitment fee |  |  | 0.175% |  |
Eurodollar term loan | Loans payable |  |  |  |  |
Changes in long-term debt |  |  |  |  |
Long-term debt |  | $ 125,000,000 |  |  |
Term of loan |  | 2 years |  |  |
Eurodollar term loan | Loans payable | Minimum |  |  |  |  |
Changes in long-term debt |  |  |  |  |
Initial interest rate for initial period |  | 1.12% |  |  |
Eurodollar term loan | Loans payable | Maximum |  |  |  |  |
Changes in long-term debt |  |  |  |  |
Initial interest rate for initial period |  | 1.15% |  |  |
Medium-term Notes 6.51 Percent Due 2014 | Medium-term note |  |  |  |  |
Changes in long-term debt |  |  |  |  |
Repayments of debt | $ 100,000,000 |  |  |  |
Debt instrument, stated interest rate (as a percent) | 6.51% |  |  |  |
Adjusted LIBOR Rate | Line of credit facility |  |  |  |  |
Credit agreement |  |  |  |  |
Basis spread on variable rate |  |  | 1.375% |  |
Adjusted LIBOR Rate | Line of credit facility | Hawaiian Electric Company |  |  |  |  |
Credit agreement |  |  |  |  |
Basis spread on variable rate |  |  | 1.25% |  |

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- Definition Represents the consolidated debt to total consolidated capitalization ratio which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
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- Definition The actual consolidated debt to total consolidated capitalization ratio which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
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- Definition Represents the consolidated subsidiary debt to total consolidated capitalization ratio which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
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- Definition The actual consolidated subsidiary debt to total consolidated capitalization ratio which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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