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Equity - Narrative (Details) $ in Millions	Apr. 29, 2022 USD ($)
Equity [Abstract]
Maximum consideration on transaction	$ 350.0
Sale of stock, agreement term	3 years

X

- Definition

Sale of Stock, Agreement Term

+ References

No definition available.

+ Details

Name:	cwt_SaleOfStockAgreementTerm
Namespace Prefix:	cwt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Sale of Stock, Maximum Consideration On Transaction

+ References

No definition available.

+ Details

Name:	cwt_SaleOfStockMaximumConsiderationOnTransaction
Namespace Prefix:	cwt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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