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Loans, financing, debentures and hedge derivative financial instruments - Summary of Appropriated Profit or Loss in The Future (Detail)
R$ in Thousands
Dec. 31, 2021
BRL (R$)
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future R$ 82,584
Up to 1 year  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 19,262
From 1 to 2 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 15,257
From 2 to 3 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 11,133
From 3 to 4 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 10,210
From 4 to 5 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 9,783
More than 5 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 16,939
Debentures [member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 54,490
Debentures [member] | Up to 1 year  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 15,060
Debentures [member] | From 1 to 2 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 11,129
Debentures [member] | From 2 to 3 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 6,990
Debentures [member] | From 3 to 4 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 6,075
Debentures [member] | From 4 to 5 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 5,886
Debentures [member] | More than 5 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 9,350
Notes in foreign market [member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 28,018
Notes in foreign market [member] | Up to 1 year  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 4,126
Notes in foreign market [member] | From 1 to 2 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 4,128
Notes in foreign market [member] | From 2 to 3 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 4,143
Notes in foreign market [member] | From 3 to 4 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 4,135
Notes in foreign market [member] | From 4 to 5 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 3,897
Notes in foreign market [member] | More than 5 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 7,589
Banco do Brasil [member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 76
Banco do Brasil [member] | Up to 1 year  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future 76
Banco do Brasil [member] | From 1 to 2 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future
Banco do Brasil [member] | From 2 to 3 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future
Banco do Brasil [member] | From 3 to 4 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future
Banco do Brasil [member] | From 4 to 5 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future
Banco do Brasil [member] | More than 5 years [Member]  
Disclosure of detailed information about borrowings [line items]  
Amount appropriated to profit or loss in the future