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Commitments and contingencies - Open tax procedures - ll (Details) - SUNAT. - Year 2010 [Member] | Dec. 31, 2020 PEN (S/) | Dec. 31, 2020 USD ($) | Dec. 04, 2020 PEN (S/) | Dec. 04, 2020 USD ($)
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Disclosure of Commitments and contingencies [Line Items] |  |  |  |
Tax debt |  |  | S/ 340,074,000 | $ 91,590,000
Collection of debt forced amount | S/ 1,800,000 | $ 486,000 |  |

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