XML 78 R67.htm IDEA: XBRL DOCUMENT
v3.8.0.1

4. Changes in accounting practices and disclosures (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017
Standard One |
SummaryOfChangesInAccountingPracticesAndDisclosuresLineItems [Line Items] |
New standards and revisions | Standard: Amendments to IAS 12 – Recognition of Deferred Income Tax for Unrealized Losses Description: Describes about the treatment of temporary differences. Impact: The application of this amendment did not impact the disclosures or amounts recognized in the annual financial statements.
Standard Two |
SummaryOfChangesInAccountingPracticesAndDisclosuresLineItems [Line Items] |
New standards and revisions | Standard: Amendments to IAS 7 – Disclosure Initiatives Description: Describes about disclosures that enable users to measure the changes in liabilities related to financing activities. Impact: The application of these amendments did not impact the disclosures or amounts recognized in the annual financial statements.
Standard Three |
SummaryOfChangesInAccountingPracticesAndDisclosuresLineItems [Line Items] |
New standards and revisions | Standard: Annual improvements to IFRSs: 2015-2017 cycle Description: Amendments to IFRS 12 – Disclosure of interests in other entities – clarification on the standard’s scope. Impact: The application of this amendment did not impact the disclosures or amounts recognized in the annual financial statements.

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

X
- Definition The discussion of the impact that the initial application of a new IFRS is expected to have on financial statements. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 8 -IssueDate 2017-01-01 -Paragraph 31 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=8&date=2017-03-01&anchor=para_31_e_i&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DiscussionOfImpactThatInitialApplicationOfIFRSIsExpectedToHaveOnFinancialStatements
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_VoluntaryChangesInAccountingPolicyAxis=SBS_StandardOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_VoluntaryChangesInAccountingPolicyAxis=SBS_StandardTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_VoluntaryChangesInAccountingPolicyAxis=SBS_StandardThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |