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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 ($)
Jan. 05, 2021
USD ($)
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