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PREFERRED STOCK (Details)	Feb. 27, 2019 shares
Equity [Abstract]
Preferred stock, shares, retired (in shares)	221,000

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- Definition

Preferred Stock, Shares, Retired

+ References

No definition available.

+ Details

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Namespace Prefix:	cwt_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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