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Regulatory Rate Filings (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended |  |
--- | --- | --- | ---
Mar. 27, 2015 | Mar. 26, 2015 | Jan. 05, 2015
Regulatory Liabilities [Line Items] |  |  |
Authorized Regulatory Surcharge, Gross | $ 1,876 sjw_AuthorizedRegulatorySurchargeGross |  |
Regulatory Rate Filings, Requested Rate Increase, Year One |  |  | 34,928 sjw_RegulatoryRateFilingsRequestedRateIncreaseYearOne
Regulatory Rate Filings, Requested Rate Increase as Percentage of Total Revenue at Time of Request, Year One |  |  | 12.22%sjw_RegulatoryRateFilingsRequestedRateIncreaseasPercentageofTotalRevenueatTimeofRequestYearOne
Regulatory Rate Filings, Requested Rate Increase, Year Two |  |  | 9,954 sjw_RegulatoryRateFilingsRequestedRateIncreaseYearTwo
Regulatory Rate Filings, Proposed Rate Increase, Percent of Authorized Revenue, Year Two |  |  | 3.11%sjw_RegulatoryRateFilingsProposedRateIncreasePercentofAuthorizedRevenueYearTwo
Regulatory Rate Filings, Requested Rate Increase, Year Three |  |  | 17,567 sjw_RegulatoryRateFilingsRequestedRateIncreaseYearThree
Regulatory Rate Filings, Requested Rate Increase, Percent of Authorized Revenue, Year Three |  |  | 5.36%sjw_RegulatoryRateFilingsRequestedRateIncreasePercentOfAuthorizedRevenueYearThree
Balancing Account, Recovery Request |  |  | 4,752 sjw_BalancingAccountRecoveryRequest
Memorandum Account, Recovery Request |  | $ 9,567 sjw_MemorandumAccountRecoveryRequest | $ 976 sjw_MemorandumAccountRecoveryRequest

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

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- Definition A request to the regulatory authority for authorization to recover under (over) -collected amounts. + References No definition available. + Details
Name: | sjw_BalancingAccountRecoveryRequest
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition A request to the regulatory authority for authorization to refund over (under) collected amounts. + References No definition available. + Details
Name: | sjw_MemorandumAccountRecoveryRequest
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Regulatory Rate Filings, Proposed Rate Increase, Percent of Authorized Revenue, Year Two + References No definition available. + Details
Name: | sjw_RegulatoryRateFilingsProposedRateIncreasePercentofAuthorizedRevenueYearTwo
Namespace Prefix: | sjw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Regulatory Rate Filings, Requested Rate Increase as Percentage of Total Revenue at Time of Request, Year One + References No definition available. + Details
Name: | sjw_RegulatoryRateFilingsRequestedRateIncreaseasPercentageofTotalRevenueatTimeofRequestYearOne
Namespace Prefix: | sjw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Regulatory Rate Filings, Requested Rate Increase as Percentage of Total Revenue at Time of Request, Year Three + References No definition available. + Details
Name: | sjw_RegulatoryRateFilingsRequestedRateIncreasePercentOfAuthorizedRevenueYearThree
Namespace Prefix: | sjw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Regulatory Rate Filings, Requested Rate Increase, Year One + References No definition available. + Details
Name: | sjw_RegulatoryRateFilingsRequestedRateIncreaseYearOne
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Regulatory Rate Filings, Requested Rate Increase, Year Three + References No definition available. + Details
Name: | sjw_RegulatoryRateFilingsRequestedRateIncreaseYearThree
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Regulatory Rate Filings, Requested Rate Increase, Year Two + References No definition available. + Details
Name: | sjw_RegulatoryRateFilingsRequestedRateIncreaseYearTwo
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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