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

X
- Definition Preferred Stock, Shares, Retired + References No definition available. + Details
Name: | cwt_PreferredStockSharesRetired
Namespace Prefix: | cwt_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration