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Subsequent Events (Details) - Chase Bank, N.A. [Member] - Line of Credit [Member] - USD ($) $ in Thousands	May 11, 2020	Apr. 29, 2020	Mar. 31, 2020
Revolving Credit Facility [Member] | San Jose Water Company [Member]
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 125,000
Revolving Credit Facility [Member] | San Jose Water Company [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 140,000
Line of Credit Facility, Increase in Maximum Borrowing Capacity	15,000
Revolving Credit Facility [Member] | SJW Corp. and SJW Land Company [Member]
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 15,000
Revolving Credit Facility [Member] | SJW Corp. and SJW Land Company [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 0
Revolving Credit Facility - Temporary [Member] | San Jose Water Company [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 50,000

X

- Definition

Line of Credit Facility, Increase in Maximum Borrowing Capacity

+ References

No definition available.

+ Details

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Namespace Prefix:	sjw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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- Details

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X

- Details

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