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Commitments and contingencies - Open tax procedures - lll (Details) - Jan. 05, 2021 - SUNAT.	PEN (S/) installment	USD ($)
Disclosure of Commitments and contingencies [Line Items]
Number of equal monthly payments	66
Tax assessment value	S/ 1,505,948,000	$ 394,227,000
Percentage over the letters of guarantee amount	5.00%
Letters of guarantee outstanding, amount	S/ 1,580,126,000	413,646,000
Deferred payment of tax debt \| Year 2010 [Member]
Disclosure of Commitments and contingencies [Line Items]
Number of equal monthly payments	66
Tax assessment value	S/ 339,928,000	88,926,000
Percentage over the letters of guarantee amount	5.00%
Letters of guarantee outstanding, amount	S/ 357,944,000	$ 93,703,000