XML 134 R123.htm IDEA: XBRL DOCUMENT
v3.8.0.1

20. Employees benefits (Details 5) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 BRL (R$)
Employees Benefits Details 5 |
Current service cost | R$ 15,228
Interest cost rates | 213,201
Participants contributions | (37,659)
Net profitability on financial assets | (179,449)
Expense to be recognized by employer | R$ 11,321

X
- References No definition available. + Details
Name: | SBS_EmployeesBenefitsDetails5Abstract
Namespace Prefix: | SBS_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | SBS_EstimateOfContributionExpectedToBePaidToPlan
Namespace Prefix: | SBS_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | SBS_EstimateOfContributionsExpectedToBePaidToPlanByParticipants
Namespace Prefix: | SBS_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | SBS_ExpensesToBeRecognizedByEmployer
Namespace Prefix: | SBS_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | SBS_NetProfitabilityOnFinancialAssets
Namespace Prefix: | SBS_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_147_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_148_d_iii&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_EstimateOfContributionsExpectedToBePaidToPlan
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration