XML 82 R66.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Employee Benefit Plans (Details 2) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014
Amounts recognized on the balance sheets: |  |  |  |  |  |
Non-current liabilities |  |  |  |  | $ (42,666) | $ (61,773)
GSWC |  |  |  |  |  |
Amounts recognized on the balance sheets: |  |  |  |  |  |
Non-current liabilities |  |  |  |  | (42,666) | (61,773)
Pension Benefits |  |  |  |  |  |
Change in Projected Benefit Obligation: |  |  |  |  |  |
Projected benefit obligation at beginning of year | $ 185,184 |  | $ 152,680 |  |  |
Service cost | 6,276 |  | 5,643 | $ 6,967 |  |
Interest cost | 7,686 |  | 7,520 | 6,907 |  |
Actuarial loss (gain) | 24,413 |  | (24,339) |  |  |
Benefits/expenses paid | (5,799) |  | (4,998) |  |  |
Projected benefit obligation at end of year | 168,934 |  | 185,184 | 152,680 |  |
Changes in Plan Assets: |  |  |  |  |  |
Fair value of plan assets at beginning of year | 140,561 |  | 127,534 |  |  |
Actual return on plan assets | 673 |  | 9,816 |  |  |
Employer contributions | 6,739 |  | 8,209 |  |  |
Benefits/expenses paid | (5,799) |  | (4,998) |  |  |
Fair value of plan assets at end of year | 142,174 |  | 140,561 | 127,534 |  |
Funded Status: |  |  |  |  |  |
Net amount recognized as accrued pension cost |  |  |  |  | (26,760) | (44,623)
Amounts recognized on the balance sheets: |  |  |  |  |  |
Non-current assets |  |  |  |  | 0 | 0
Current liabilities |  |  |  |  | 0 | 0
Non-current liabilities |  |  |  |  | (26,760) | (44,623)
Net amount recognized |  |  |  |  | (26,760) | (44,623)
Amounts recognized in regulatory assets consist of: |  |  |  |  |  |
Initial net obligation |  |  |  |  | 0 | 0
Prior service cost (credit) |  |  |  |  | 49 | 167
Net (gain) loss |  |  |  |  | 21,921 | 39,003
Regulatory assets | 39,170 |  | 15,866 | 15,866 | 21,970 | 39,170
Unfunded accrued pension cost |  |  |  |  | 4,790 | 5,453
Net liability recognized |  |  |  |  | 26,760 | 44,623
Changes in plan assets and benefit obligations recognized in regulatory assets: |  |  |  |  |  |
Regulatory asset at beginning of year | 39,170 |  | 15,866 |  |  |
Net loss (gain) | (15,292) |  | 23,422 |  |  |
Amortization of initial net obligation | 0 |  | 0 |  |  |
Amortization of prior service (cost) credit | (118) |  | (118) |  |  |
Amortization of net loss | (1,790) |  | 0 |  |  |
Total change in regulatory asset | (17,200) |  | 23,304 |  |  |
Regulatory asset at end of year | 21,970 |  | 39,170 | 15,866 |  |
Change in regulatory asset | (17,200) |  | 23,304 |  |  |
Net periodic pension costs | 6,075 |  | 4,383 | 9,296 |  |
Total recognized in net periodic pension cost and regulatory asset | (11,125) |  | 27,687 |  |  |
Estimated amounts that will be amortized from regulatory asset over the next fiscal year: |  |  |  |  |  |
Initial net obligation | 0 |  | 0 |  |  |
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit) | (49) |  | (118) |  |  |
Net loss | (510) |  | (1,878) |  |  |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |  |  |  |
Projected benefit obligation |  |  |  |  | 168,934 | 185,184
Accumulated benefit obligation |  |  |  |  | 155,469 | 160,510
Fair value of plan assets |  |  |  |  | $ 142,174 | $ 140,561
Weighted-average assumptions used to determine benefit obligations at year end: |  |  |  |  |  |
Discount rate (as a percent) |  |  |  |  | 4.65% | 4.25%
Rate of compensation increase (as a percent) |  |  |  |  |  | 4.00%
Components of Net Periodic Benefits Cost: |  |  |  |  |  |
Service cost | 6,276 |  | 5,643 | 6,967 |  |
Interest cost | 7,686 |  | 7,520 | 6,907 |  |
Expected return on plan assets | (9,795) |  | (8,898) | (7,574) |  |
Amortization of transition | 0 |  | 0 | 0 |  |
Amortization of prior service cost (benefit) | 118 |  | 118 | 118 |  |
Amortization of actuarial loss | 1,790 |  | 0 | 2,878 |  |
Net periodic pension costs | (6,075) |  | (4,383) | (9,296) |  |
Regulatory adjustment - deferred | 523 |  | 1,622 | (1,920) |  |
Total expense recognized, before allocation to overhead pool | $ 6,598 |  | $ 6,005 | $ 7,376 |  |
Weighted-average assumptions used to determine net periodic cost: |  |  |  |  |  |
Discount rate (as a percent) | 4.25% |  | 5.10% | 4.30% |  |
Expected long-term return on plan assets (as a percent) | 7.00% |  | 7.00% | 7.00% |  |
Rate of compensation increase (as a percent) | 4.00% |  | 4.00% | 4.00% |  |
Pension Benefits | GSWC |  |  |  |  |  |
Components of Net Periodic Benefits Cost: |  |  |  |  |  |
Regulatory adjustment - deferred | $ 523 |  | $ 1,600 | $ 1,900 |  |
Post-Retirement Medical Benefits |  |  |  |  |  |
Change in Projected Benefit Obligation: |  |  |  |  |  |
Projected benefit obligation at beginning of year | 12,326 |  | 11,388 |  |  |
Service cost | 340 |  | 348 | 407 |  |
Interest cost | 435 |  | 495 | 439 |  |
Actuarial loss (gain) | 3,375 |  | (437) |  |  |
Benefits/expenses paid | (333) |  | (342) |  |  |
Projected benefit obligation at end of year | 9,393 |  | 12,326 | 11,388 |  |
Changes in Plan Assets: |  |  |  |  |  |
Fair value of plan assets at beginning of year | 10,723 |  | 9,873 |  |  |
Actual return on plan assets | 115 |  | 951 |  |  |
Employer contributions | 109 |  | 241 |  |  |
Benefits/expenses paid | (333) |  | (342) |  |  |
Fair value of plan assets at end of year | 10,614 |  | 10,723 | 9,873 |  |
Funded Status: |  |  |  |  |  |
Net amount recognized as accrued pension cost |  |  |  |  | $ 1,221 | $ (1,603)
Amounts recognized on the balance sheets: |  |  |  |  |  |
Non-current assets |  |  |  |  | 1,221 | 0
Current liabilities |  |  |  |  | 0 | 0
Non-current liabilities |  |  |  |  | 0 | (1,603)
Net amount recognized |  |  |  |  | 1,221 | (1,603)
Amounts recognized in regulatory assets consist of: |  |  |  |  |  |
Initial net obligation |  |  |  |  | 0 | 0
Prior service cost (credit) |  |  |  |  | (34) | (234)
Net (gain) loss |  |  |  |  | (5,572) | (2,891)
Regulatory assets | (3,125) |  | (3,175) | (3,175) | (5,606) | (3,125)
Unfunded accrued pension cost |  |  |  |  | 4,385 | 4,728
Net liability recognized |  |  |  |  | (1,221) | 1,603
Changes in plan assets and benefit obligations recognized in regulatory assets: |  |  |  |  |  |
Regulatory asset at beginning of year | (3,125) |  | (3,175) |  |  |
Net loss (gain) | (2,997) |  | (61) |  |  |
Amortization of initial net obligation | 0 |  | (419) |  |  |
Amortization of prior service (cost) credit | 200 |  | 200 |  |  |
Amortization of net loss | 316 |  | 330 |  |  |
Total change in regulatory asset | (2,481) |  | 50 |  |  |
Regulatory asset at end of year | (5,606) |  | (3,125) | (3,175) |  |
Change in regulatory asset | (2,481) |  | 50 |  |  |
Net periodic pension costs | (234) |  | 278 | 676 |  |
Total recognized in net periodic pension cost and regulatory asset | (2,715) |  | 328 |  |  |
Estimated amounts that will be amortized from regulatory asset over the next fiscal year: |  |  |  |  |  |
Initial net obligation | 0 |  | 0 |  |  |
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit) | 34 |  | 200 |  |  |
Net loss | 599 |  | 213 |  |  |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |  |  |  |
Projected benefit obligation |  |  |  |  | 9,393 | 12,326
Fair value of plan assets |  |  |  |  | $ 10,614 | $ 10,723
Weighted-average assumptions used to determine benefit obligations at year end: |  |  |  |  |  |
Discount rate (as a percent) |  |  |  |  | 4.25% | 3.80%
Components of Net Periodic Benefits Cost: |  |  |  |  |  |
Service cost | 340 |  | 348 | 407 |  |
Interest cost | 435 |  | 495 | 439 |  |
Expected return on plan assets | (493) |  | (453) | (382) |  |
Amortization of transition | 0 |  | 418 | 419 |  |
Amortization of prior service cost (benefit) | (200) |  | (200) | (200) |  |
Amortization of actuarial loss | (316) |  | (330) | (7) |  |
Net periodic pension costs | 234 |  | (278) | (676) |  |
Regulatory adjustment - deferred | 0 |  | 0 | 0 |  |
Total expense recognized, before allocation to overhead pool | $ (234) |  | $ 278 | $ 676 |  |
Weighted-average assumptions used to determine net periodic cost: |  |  |  |  |  |
Discount rate (as a percent) | 3.80% |  | 4.65% | 3.75% |  |
Union plan |  |  |  |  |  |
Weighted-average assumptions used to determine net periodic cost: |  |  |  |  |  |
Expected long-term return on plan assets (as a percent) | 7.00% | [1] | 7.00% | 7.00% |  |
Non-union plan |  |  |  |  |  |
Weighted-average assumptions used to determine net periodic cost: |  |  |  |  |  |
Expected long-term return on plan assets (as a percent) | 4.20% | [1] | 4.20% | 4.20% |  |
SERP |  |  |  |  |  |
Change in Projected Benefit Obligation: |  |  |  |  |  |
Projected benefit obligation at beginning of year | $ 15,926 |  | $ 12,296 |  |  |
Service cost | 814 |  | 768 | $ 803 |  |
Interest cost | 653 |  | 615 | 514 |  |
Actuarial loss (gain) | (683) |  | 2,497 |  |  |
Benefits/expenses paid | (393) |  | (250) |  |  |
Projected benefit obligation at end of year | 16,317 |  | 15,926 | 12,296 |  |
Changes in Plan Assets: |  |  |  |  |  |
Fair value of plan assets at beginning of year | 0 |  |  |  |  |
Benefits/expenses paid | (393) |  | (250) |  |  |
Fair value of plan assets at end of year | 0 |  | 0 |  |  |
Funded Status: |  |  |  |  |  |
Net amount recognized as accrued pension cost |  |  |  |  | $ (16,317) | $ (15,926)
Amounts recognized on the balance sheets: |  |  |  |  |  |
Current liabilities |  |  |  |  | (411) | (379)
Non-current liabilities |  |  |  |  | (15,906) | (15,547)
Net amount recognized |  |  |  |  | (16,317) | (15,926)
Amounts recognized in regulatory assets consist of: |  |  |  |  |  |
Prior service cost (credit) |  |  |  |  | 36 | 153
Net (gain) loss |  |  |  |  | 3,416 | 4,530
Regulatory assets | 4,683 |  | 2,486 | 2,486 | 3,452 | 4,683
Unfunded accrued pension cost |  |  |  |  | 12,865 | 11,243
Net liability recognized |  |  |  |  | 16,317 | 15,926
Changes in plan assets and benefit obligations recognized in regulatory assets: |  |  |  |  |  |
Regulatory asset at beginning of year | 4,683 |  | 2,486 |  |  |
Net loss (gain) | (683) |  | 2,497 |  |  |
Amortization of prior service (cost) credit | (117) |  | (161) |  |  |
Amortization of net loss | (431) |  | (139) |  |  |
Total change in regulatory asset | (1,231) |  | 2,197 |  |  |
Regulatory asset at end of year | 3,452 |  | 4,683 | 2,486 |  |
Change in regulatory asset | (1,231) |  | 2,197 |  |  |
Net periodic pension costs | 2,015 |  | 1,683 | 1,817 |  |
Total recognized in net periodic pension cost and regulatory asset | 784 |  | 3,880 |  |  |
Estimated amounts that will be amortized from regulatory asset over the next fiscal year: |  |  |  |  |  |
Initial net obligation | 0 |  | 0 |  |  |
Prior service cost | 25 |  | 117 |  |  |
Net loss | (292) |  | (431) |  |  |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |  |  |  |
Accumulated benefit obligation |  |  |  |  | 14,533 | 13,992
Fair value of plan assets |  |  |  |  | $ 0 | $ 0
Weighted-average assumptions used to determine benefit obligations at year end: |  |  |  |  |  |
Discount rate (as a percent) |  |  |  |  | 4.61% | 4.15%
Rate of compensation increase (as a percent) |  |  |  |  | 4.00% | 4.00%
Components of Net Periodic Benefits Cost: |  |  |  |  |  |
Service cost | 814 |  | 768 | 803 |  |
Interest cost | 653 |  | 615 | 514 |  |
Amortization of prior service cost (benefit) | 117 |  | 161 | 161 |  |
Amortization of actuarial loss | 431 |  | 139 | 339 |  |
Net periodic pension costs | $ (2,015) |  | $ (1,683) | $ (1,817) |  |
Weighted-average assumptions used to determine net periodic cost: |  |  |  |  |  |
Discount rate (as a percent) | 4.15% |  | 5.05% | 4.20% |  |
Rate of compensation increase (as a percent) | 4.00% |  | 4.00% | 4.00% |  |
Minimum [Member] | Pension Benefits |  |  |  |  |  |
Weighted-average assumptions used to determine benefit obligations at year end: |  |  |  |  |  |
Rate of compensation increase (as a percent) |  |  |  |  | 3.00% |
Maximum [Member] | Pension Benefits |  |  |  |  |  |
Weighted-average assumptions used to determine benefit obligations at year end: |  |  |  |  |  |
Rate of compensation increase (as a percent) |  |  |  |  | 8.00% |
Real Estate Funds [Member] | Pension Benefits |  |  |  |  |  |
Changes in Plan Assets: |  |  |  |  |  |
Fair value of plan assets at end of year | $ 7,418 |  |  |  |  |
[1] | *7.0% for union plan, 4.2% for non-union, net of income taxes in 2015, 2014 and 2013.

X
- Definition Represents the amortization of net losses that are recognized as a component of regulatory assets (liability). + References No definition available. + Details
Name: | awr_DefinedBenefitPlanAmortizationOfGainsLossesRegulatoryAssets
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amounts related to initial net obligation expected to be recognized as components of regulatory asset over the next fiscal year that follows the most recent annual statement of financial position presented. + References No definition available. + Details
Name: | awr_DefinedBenefitPlanAmortizationOfInitialNetObligationFromRegulatoryAsset
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amortization of initial net obligation that are recognized as a component of regulatory assets (liability). + References No definition available. + Details
Name: | awr_DefinedBenefitPlanAmortizationOfInitialNetObligationRegulatoryAssets
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the net gains (losses) that are not recognized immediately and are expected to be recognized as components of regulatory asset over the next fiscal year that follows the most recent annual statement of financial position presented. + References No definition available. + Details
Name: | awr_DefinedBenefitPlanAmortizationOfNetGainsLossesFromRegulatoryAsset
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the prior service cost or credit expected to be recognized as components of regulatory asset over the next fiscal year that follows the most recent annual statement of financial position presented. + References No definition available. + Details
Name: | awr_DefinedBenefitPlanAmortizationOfNetPriorServiceCostCreditFromRegulatoryAsset
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amortization of prior service cost (credit) that are recognized as a component of regulatory assets (liability). + References No definition available. + Details
Name: | awr_DefinedBenefitPlanAmortizationOfPriorServiceCostCreditRegulatoryAssets
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of initial net obligation recognized in regulatory assets (liability). + References No definition available. + Details
Name: | awr_DefinedBenefitPlanAmountsRecognizedInRegulatoryAssetLiabilityInitialNetObligation
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the net gains and losses recognized in regulatory asset (liability). + References No definition available. + Details
Name: | awr_DefinedBenefitPlanAmountsRecognizedInRegulatoryAssetLiabilityNetGainsLosses
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | awr_DefinedBenefitPlanAmountsRecognizedInRegulatoryAssetsLiabilityAbstract
Namespace Prefix: | awr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount recognized in regulatory asset (liability). + References No definition available. + Details
Name: | awr_DefinedBenefitPlanAmountsRecognizedinRegulatoryAssetLiability
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the prior service cost (credit) recognized in regulatory asset (liability). + References No definition available. + Details
Name: | awr_DefinedBenefitPlanAmountsRecognizedinRegulatoryAssetLiabilityPriorServiceCostCredit
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Defined Benefit Plan, Amounts Recognized in Regulatory Assets (Liabilities), Net + References No definition available. + Details
Name: | awr_DefinedBenefitPlanAmountsRecognizedinRegulatoryAssetsLiabilitiesNet
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of unfunded accrued pension cost recognized in regulatory assets that is associated with the defined benefit pension plans and other post-retirement defined benefit plans. + References No definition available. + Details
Name: | awr_DefinedBenefitPlanAmountsUnfundedAccruedPensionCost
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | awr_DefinedBenefitPlanChangeInPlanAssetsAndBenefitObligationsRecognizedInRegulatoryAssetsRollForward
Namespace Prefix: | awr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the net amount of loss (gain) that are recognized as a component of regulatory assets (liability). + References No definition available. + Details
Name: | awr_DefinedBenefitPlanCostRecognizedInRegulatoryAssetsLiability
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | awr_DefinedBenefitPlanEstimatedAmortizationFromRegulatoryAssetOverNextFiscalYearAbstract
Namespace Prefix: | awr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the net amount of loss (gain) that are recognized as a component of regulatory assets. + References No definition available. + Details
Name: | awr_DefinedBenefitPlanNetGainsLossesRegulatoryAssets
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount recognized in net periodic pension cost and regulatory asset. + References No definition available. + Details
Name: | awr_DefinedBenefitPlanNetPeriodicBenefitCostAndCostRecognizedInRegulatoryAssets
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of net periodic benefit cost for defined benefit plans during the period, before allocation to overhead pool. + References No definition available. + Details
Name: | awr_DefinedBenefitPlanNetPeriodicBenefitCostBeforeAllocationToOverheadPool
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost) -URI http://asc.fasb.org/extlink&oid=6504192 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6504226 + Details
Name: | us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=49168827 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanActuarialGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of gains or losses recognized in net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
Name: | us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of the transition obligation or asset recognized in net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(6) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
Name: | us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The interest rate used to adjust for the time value of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
Name: | us-gaap_DefinedBenefitPlanBenefitObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=49170737 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Postretirement Benefits -URI http://asc.fasb.org/extlink&oid=6521376 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanBenefitsPaid
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
Name: | us-gaap_DefinedBenefitPlanFundedStatusOfPlan
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanFundedStatusOfPlanAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanInterestCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 + Details
Name: | us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 + Details
Name: | us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 + Details
Name: | us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanServiceCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInOtherRegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 + Details
Name: | us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=awr_GoldenStateWaterCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=awr_OtherPostretirementBenefitUnionPlanDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=awr_OtherPostretirementBenefitNonunionPlanDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_RealEstateFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |