XML 46 R34.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Regulatory Rate Filings (Details) - USD ($) | Jun. 26, 2017 | Jun. 01, 2017 | Apr. 03, 2017 | Jun. 06, 2017
--- | --- | --- | --- | ---
Public Utilities, General Disclosures [Line Items] |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 7,550,000 |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  |  | 2.10% |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 12,407,000 |  |  |
Public Utilities, Approved Rate Increase (Decrease), Percentage | 3.46% |  |  |
Requested Service Charge Refund |  |  |  | $ 1,794,000
2014 WCMA [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Memorandum Account, Authorized Recovery |  | $ 996,000 |  |
Authorized Regulatory Surcharge, Per CCF |  | 0.08 |  |
2015 WCMA [Member] |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Memorandum Account, Authorized Recovery |  | 2,233,000 |  |
Authorized Regulatory Surcharge, Per CCF |  | $ 0.1441 |  |

X
- Definition Authorized Regulatory Surcharge, Per CCF + References No definition available. + Details
Name: | sjw_AuthorizedRegulatorySurchargePerCCF
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Memorandum accounts, Authorized Recovery + References No definition available. + Details
Name: | sjw_MemorandumAccountAuthorizedRecovery
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Requested Service Charge Refund + References No definition available. + Details
Name: | sjw_RequestedServiceChargeRefund
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of public utility's approved rate increase (decrease) by regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of public utility's approved rate increase (decrease) by regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedRateIncreaseDecreasePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of public utility's requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of public utility's requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreasePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=sjw_A2014WCMAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=sjw_A2015WCMAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |