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18 Revenue (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue [abstract]      
Tuition fees [1] R$ 1,388,735 R$ 856,561 R$ 385,784
Other 99,817 43,116 4,414
Deductions      
Granted discounts (89,017) (43,767) (11,104)
Early payment discounts (29,299) (8,523) (3,189)
Returns (11,437) (7,462) (1,801)
Taxes (49,629) (28,157) (24,239)
PROUNI (107,979) (61,138) (15,930)
Net revenue from contracts with customers 1,201,191 750,630 333,935
Timing of revenue recognition of net revenue from contracts with customers      
Tuition, digital content and app subscription fees - Transferred over time 1,128,558 713,827 331,045
Other - Transferred at a point in time R$ 72,633 R$ 36,803 R$ 2,890
[1] As mentioned in Note 1, the Company assessed, in connection with the social distancing requirements, whether it has satisfied all performance obligations of its contracts with customers, according to IFRS15, and concluded it was necessary to defer a portion of it's net revenues in the second semester of 2020. As result, R$2,361 of net revenue were deferred to the first semester of 2021 and recorded in advances from customers.