XML 87 R70.htm IDEA: XBRL DOCUMENT v3.10.0.1

SJW Group and CTWS Merger (the “Merger”) (Details)	Mar. 14, 2018 $ / shares
CTWS [Member]
Business Acquisition [Line Items]
Acquiree's common shares converted in cash (in USD per share)	$ 70.00

X

- Definition

Business Combination, Consideration Transferred, Acquiree's Common Shares Converted In Cash Per Share

+ References

No definition available.

+ Details

Name:	sjw_BusinessCombinationConsiderationTransferredAcquireesCommonSharesConvertedInCashPerShare
Namespace Prefix:	sjw_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

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_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=sjw_CTWSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: