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Securities - Summary of securities classified by maturity (Detail) - BRL (R$)
R$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of offsetting of financial liabilities [line items]      
Financial assets R$ 56,217,071 R$ 41,888,778 R$ 16,582,616
Financial liabilities 44,627,989 31,842,054 15,216,037
Financial Assets At Fair Value Through Profit Or Loss And Other Comprehensive Income Category [member]      
Disclosure of offsetting of financial liabilities [line items]      
Current financial assets 8,417,190 9,804,819 1,875,374
Non-current financial assets 21,570,920 15,254,691 5,111,375
Current financial liabilities 721,131 2,021,707 1,192,877
Non-current financial liabilities     66,702
Financial assets at amortised cost, category [member]      
Disclosure of offsetting of financial liabilities [line items]      
Current financial assets 1,267,826 2,266,971 155,292
Non Stated Maturity [member] | Financial Assets At Fair Value Through Profit Or Loss And Other Comprehensive Income Category [member]      
Disclosure of offsetting of financial liabilities [line items]      
Current financial assets 5,405,233 4,999,333 1,425,401
Current financial liabilities 721,131 2,021,707  
Non Stated Maturity [member] | Financial assets at amortised cost, category [member]      
Disclosure of offsetting of financial liabilities [line items]      
Current financial assets   807,218  
Not later than three months [member] | Financial Assets At Fair Value Through Profit Or Loss And Other Comprehensive Income Category [member]      
Disclosure of offsetting of financial liabilities [line items]      
Current financial assets 1,814,839 257,544 192,208
Current financial liabilities     1,184,972
Not later than three months [member] | Financial assets at amortised cost, category [member]      
Disclosure of offsetting of financial liabilities [line items]      
Current financial assets 423,837 807,218  
From 3 to 12 months [member]      
Disclosure of offsetting of financial liabilities [line items]      
Financial liabilities   1,167,519 1,458,330
From 3 to 12 months [member] | Financial Assets At Fair Value Through Profit Or Loss And Other Comprehensive Income Category [member]      
Disclosure of offsetting of financial liabilities [line items]      
Current financial assets 1,197,118 4,547,942 257,765
Current financial liabilities     7,905
From 3 to 12 months [member] | Financial assets at amortised cost, category [member]      
Disclosure of offsetting of financial liabilities [line items]      
Current financial assets 843,989 1,459,753 155,292
Later than one year [member] | Financial Assets At Fair Value Through Profit Or Loss And Other Comprehensive Income Category [member]      
Disclosure of offsetting of financial liabilities [line items]      
Non-current financial assets 21,570,920 15,254,691 5,111,375
Non-current financial liabilities     66,702
Fair value [member]      
Disclosure of offsetting of financial liabilities [line items]      
Financial assets 31,255,936 27,326,481 7,142,041
Financial liabilities R$ 721,131 R$ 2,021,707 R$ 1,259,579