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v3.4.0.3

General - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2015 | Mar. 31, 2015 | Dec. 31, 2015 | Jan. 05, 2015
Regulatory Liabilities [Line Items] |  |  |  |
Water reduction target goal (percent) |  | 20.00% | 30.00% |
Mandatory Water Reduction, Percentage | 25.00% |  |  |
Memorandum Account, Recovery Request |  |  |  | $ 976

X
- Definition Mandatory Water Reduction, Percentage + References No definition available. + Details
Name: | sjw_MandatoryWaterReductionPercentage
Namespace Prefix: | sjw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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 Water Reduction Target Goal, Percentage + References No definition available. + Details
Name: | sjw_WaterReductionTargetGoalPercentage
Namespace Prefix: | sjw_
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_RegulatoryLiabilitiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration