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Costs and expenses by nature (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Notes and other explanatory information [abstract]      
Payroll (i) R$ (1,370,361) R$ (1,236,666) R$ (1,149,225)
Hospital and medical agreements (80,449) (94,583) (86,151)
Depreciation and amortization (373,344) (333,341) (289,511)
Lease expenses (12,617) (11,207) (10,871)
Utilities (24,722) (22,730) (20,403)
Maintenance (134,156) (127,777) (105,919)
Share-based compensation (15,318) (32,424) (31,535)
Tax expenses (12,091) (12,105) (14,447)
Sales and marketing (114,803) (85,469) (74,140)
Allowance for expected credit losses (57,090) (60,894) (74,552)
Travel expenses (26,144) (20,345) (16,098)
Consulting fees (32,645) (46,022) (62,630)
Other (230,310) (201,361) (189,015)
Total (2,484,050) (2,284,924) (2,124,497)
Cost of services (1,313,895) (1,215,603) (1,109,813)
Selling, general and administrative expenses R$ (1,113,065) R$ (1,008,427) R$ (940,132)