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Commitments and contingencies - Open tax procedures - V (Details) - SUNAT. | Jan. 14, 2021 PEN (S/) installment | Jan. 05, 2021 PEN (S/) installment | Jan. 14, 2021 USD ($) | Jan. 05, 2021 USD ($)
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Disclosure of Commitments and contingencies [Line Items] |  |  |  |
Number of equal monthly payments |  | 66 |  |
Tax assessment value |  | S/ 1,505,948,000 |  | $ 405,588,000
Percentage over the letters of guarantee amount |  | 5.00% |  |
Letters of guarantee outstanding, amount |  | S/ 1,580,126,000 |  | $ 425,566,000
Deferred payment of tax debt | Year 2009 [Member] |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |
Number of equal monthly payments | 66 |  |  |
Tax assessment value | S/ 184,922,000 |  | $ 49,804,000 |
Percentage over the letters of guarantee amount | 5.00% |  |  |
Letters of guarantee outstanding, amount | S/ 194,398,000 |  | $ 52,356,000 |

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