XML 98 R77.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Equity Plans - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Apr. 26, 2023
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Fair value of restricted stock awards | $ 4,788 | $ 4,170 | $ 4,369 |
Performance-based and market-based restricted stock awards issued (in shares) | 33,670 | 15,955 | 11,551 |
Performance-based and market-based restricted stock awards vested (in shares) | 30,770 |  |  |
Performance-based and market-based restricted stock awards outstanding (in shares) | 29,199 |  |  |
Employee stock purchase plan (in shares) | 42,853 | 34,122 | 36,585 |
Restricted stock and deferred restricted stock |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Share-based payment arrangement, nonvested award, cost not yet recognized, amount | $ 5,485 |  |  |
Period for recognition of compensation cost | 1 year 8 months 19 days |  |  |
Performance Shares | Minimum |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Range of shares issuable | 0.00% |  |  |
Performance Shares | Maximum |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Range of shares issuable | 150.00% |  |  |
Market-based RSU | Minimum |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Range of shares issuable | 0.00% |  |  |
Market-based RSU | Maximum |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Range of shares issuable | 200.00% |  |  |
Incentive Plan |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Remaining shares available for issuance (in shares) |  |  |  | 1,142,000
Incentive Plan | Restricted stock and deferred restricted stock |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Remaining shares available for issuance (in shares) | 1,030,998 |  |  |
Shares issuable under the plan upon exercise of outstanding awards (in shares) | 191,177 |  |  |
Incentive Plan | Common Stock |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Maximum number of shares per employee (in shares) | 600,000 |  |  |
Shares issued pursuant to the plan (in shares) | 1,142,770 | 1,080,759 | 1,013,782 |
Shares issuable under the plan upon exercise of outstanding awards (in shares) |  | 150,704 | 162,502 |
Employee Stock Purchase Plan |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Purchase price of common stock to employees under the plan, percent | 85.00% |  |  |
Maximum percent of base salary employees can designate for share purchase under the plan | 10.00% |  |  |
Employee Stock Purchase Plan | Common Stock |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |
Remaining shares available for issuance (in shares) | 457,147 |  |  |
Number of shares reserved for issuance under the plan (in shares) | 500,000 |  |  |

X
- Definition Restricted Stock Awards, Performance-based, Issued, Intrinsic Value + References No definition available. + Details
Name: | sjw_RestrictedStockAwardsPerformancebasedIssuedIntrinsicValue
Namespace Prefix: | sjw_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Restricted Stock Awards, Performance-based, Outstanding Balance + References No definition available. + Details
Name: | sjw_RestrictedStockAwardsPerformancebasedOutstandingBalance
Namespace Prefix: | sjw_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Restricted Stock Awards, Performance-based, Vested Balance + References No definition available. + Details
Name: | sjw_RestrictedStockAwardsPerformancebasedVestedBalance
Namespace Prefix: | sjw_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Shares Issuable Upon Vesting + References No definition available. + Details
Name: | sjw_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuableUponVesting
Namespace Prefix: | sjw_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cumulative number of shares issued pursuant to the Plan. + References No definition available. + Details
Name: | sjw_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedPursuantToPlan
Namespace Prefix: | sjw_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested, Grant Date Fair Value + References No definition available. + Details
Name: | sjw_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedGrantDateFairValue
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
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_OptionIndexedToIssuersEquityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The highest quantity of shares an employee can purchase under the plan per period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of vesting of award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=sjw_RestrictedStockAndDeferredRestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=sjw_MarketbasedRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=sjw_IncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=sjw_EmployeeStockPurchasePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |