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23. Knowledge retention program (Tables)

12 Months Ended

Dec. 31, 2018

Knowledge Retention Program

Knowledge retention program

Length of service at SABESP (years)	% of the Guarantee Fund for Length of Service (FGTS)
More than 15	40%
11 - 15	30%
6 - 10	15%
0 - 5	5%

X

- References

No definition available.

+ Details

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Namespace Prefix:	SBS_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	SBS_SummaryOfKnowledgeRetentionProgramTableTextBlock
Namespace Prefix:	SBS_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration