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Operating costs and expenses (Details) - BRL (R$) R$ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
IfrsStatementLineItems [Line Items] |  |
Operating costs | R$ (3,975,427) | R$ (3,653,723)
Selling expenses | (210,087) | (225,657)
Bad debt expense, net of recoveries | 190,518 | 162,805
Administrative expenses | (538,138) | (284,679)
Operating costs and expenses | (4,914,170) | (4,326,864)
Salaries Payroll Charges And Benefits [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Operating costs | (505,690) | (583,855)
Selling expenses | (62,115) | (70,517)
Administrative expenses | (112,499) | (55,142)
Operating costs and expenses | (680,304) | (709,514)
Pension Obligations [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Operating costs | (5,810) | (1,656)
Selling expenses | (840) | (185)
Administrative expenses | (21,486) | (32,822)
Operating costs and expenses | (28,136) | (34,663)
Construction Costs [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Operating costs | (1,306,723) | (1,153,015)
Operating costs and expenses | (1,306,723) | (1,153,015)
General Supplies [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Operating costs | (113,440) | (85,831)
Selling expenses | (1,859) | (1,067)
Administrative expenses | 24,510 | (601)
Operating costs and expenses | (90,789) | (87,499)
Treatment Supplies [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Operating costs | (141,370) | (164,899)
Operating costs and expenses | (141,370) | (164,899)
Outside Services [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Operating costs | (504,745) | (435,484)
Selling expenses | (101,066) | (109,177)
Administrative expenses | (77,011) | (80,267)
Operating costs and expenses | (682,822) | (624,928)
Electricity One [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Operating costs | (393,822) | (395,026)
Selling expenses | (210) | (191)
Administrative expenses | (372) | (583)
Operating costs and expenses | (394,404) | (395,800)
General Expenses [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Operating costs | (283,516) | (227,169)
Selling expenses | (26,628) | (27,626)
Administrative expenses | (294,810) | (60,011)
Operating costs and expenses | (604,954) | (314,806)
Depreciation And Amortization [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Operating costs | (720,311) | (606,788)
Selling expenses | (17,369) | (16,894)
Administrative expenses | (36,105) | (33,463)
Operating costs and expenses | (773,785) | (657,145)
Bad Debt Expense Net Of Recoveries [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Bad debt expense, net of recoveries | (190,518) | (162,805)
Operating costs and expenses | (190,518) | (162,805)
Tax Expense [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Administrative expenses | (20,365) | (21,790)
Operating costs and expenses | R$ (20,365) | R$ (21,790)

X
- Definition Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Impairment loss (reversal of impairment loss) recognised in profit or loss] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 20 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_20_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of expenses that the entity classifies as being administrative. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2023-01-01 -Paragraph 35 -Subparagraph b -Clause vi -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=26&code=ifrs-tx-2023-en-r&anchor=para_35_b_vi&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 103 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_103&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 99 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_99&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of all expenses directly or indirectly attributed to the goods or services sold. Attributed expenses include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, such as depreciation and maintenance of factory buildings and equipment used in the production process, unallocated production overheads, and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 99 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_99&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 103 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_103&doctype=Standard -URIDate 2023-03-23 + Details
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