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Derivative instruments - Cross-currency Interest Rate Swap (Details) - Cross-currency interest rate swap - Cash Flow Hedging R$ in Thousands, $ in Thousands | Oct. 31, 2020 BRL (R$) | Oct. 31, 2020 USD ($) | Jul. 31, 2017 BRL (R$) | Jul. 31, 2017 USD ($) | Jun. 30, 2017 BRL (R$) | Jun. 30, 2017 USD ($) | Apr. 30, 2017 BRL (R$) | Apr. 30, 2017 USD ($) | Feb. 28, 2017 BRL (R$) | Feb. 28, 2017 USD ($)
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Banco Santander S.A. | Payable | Subsidiaries |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Payable amount | R$ |  |  |  |  |  |  | R$ 155,500 |  |  |
Banco Santander S.A. | Payable | Brazil Real | Subsidiaries |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 13.77% | 13.77% |  |
Banco Santander S.A. | Receivable | Subsidiaries |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 6.91% | 6.91% |  |
Receivable amount | $ |  |  |  |  |  |  |  | $ 50,000 |  |
Cross-Currency Interest Rate Swap Originated November 2013 | JP Morgan Chase Bank, N.A. | Payable |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Payable amount | R$ |  |  |  |  |  |  |  |  | R$ 108,000 |
Cross-Currency Interest Rate Swap Originated November 2013 | JP Morgan Chase Bank, N.A. | Payable | Brazil Real |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 13.00% | 13.00%
Cross-Currency Interest Rate Swap Originated November 2013 | JP Morgan Chase Bank, N.A. | Receivable |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 4.38% | 4.38%
Receivable amount | $ |  |  |  |  |  |  |  |  |  | $ 35,390
Cross-Currency Interest Rate Swap Originated November 2013 | BAML | Payable | Subsidiaries |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Payable amount | R$ |  |  |  |  |  |  | R$ 156,250 |  |  |
Cross-Currency Interest Rate Swap Originated November 2013 | BAML | Payable | Brazil Real | Subsidiaries |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 13.64% | 13.64% |  |
Cross-Currency Interest Rate Swap Originated November 2013 | BAML | Receivable | Subsidiaries |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 6.91% | 6.91% |  |
Receivable amount | $ |  |  |  |  |  |  |  | $ 50,000 |  |
Cross-Currency Interest Rate Swap Originated June 2017 | JP Morgan Chase Bank, N.A. | Payable |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Payable amount | R$ |  |  |  |  | R$ 98,670 |  |  |  |  |
Cross-Currency Interest Rate Swap Originated June 2017 | JP Morgan Chase Bank, N.A. | Payable | Brazil Real |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 13.00% | 13.00% |  |  |  |
Cross-Currency Interest Rate Swap Originated June 2017 | JP Morgan Chase Bank, N.A. | Receivable |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 6.02% | 6.02% |  |  |  |
Receivable amount | $ |  |  |  |  |  | $ 30,000 |  |  |  |
Cross-Currency Interest Rate Swap Originated July 2017 | Citibank N.A. | Payable |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Payable amount | R$ |  |  | R$ 94,200 |  |  |  |  |  |  |
Cross-Currency Interest Rate Swap Originated July 2017 | Citibank N.A. | Payable | Brazil Real |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 13.00% | 13.00% |  |  |  |  |  |
Cross-Currency Interest Rate Swap Originated July 2017 | Citibank N.A. | Receivable |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 6.29% | 6.29% |  |  |  |  |  |
Receivable amount | $ |  |  |  | $ 30,000 |  |  |  |  |  |
Cross-Currency Interest Rate Swap Originated October 2020 | Citibank N.A. | Payable |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Payable amount | R$ | R$ 112,738 |  |  |  |  |  |  |  |  |
Cross-Currency Interest Rate Swap Originated October 2020 | Citibank N.A. | Payable | Brazil Real |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate | 13.00% | 13.00% |  |  |  |  |  |  |  |
Cross-Currency Interest Rate Swap Originated October 2020 | Citibank N.A. | Receivable |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate | 8.08% | 8.08% |  |  |  |  |  |  |  |
Receivable amount | $ |  | $ 20,049 |  |  |  |  |  |  |  |

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