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Commitments and contingencies - Open tax procedures SUNAT (Details) - SUNAT.
Jul. 30, 2021
PEN (S/)
Jul. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Apr. 01, 2021
Mar. 31, 2021
Jan. 05, 2021
PEN (S/)
installment
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 $ 376,675,000
Percentage over the letters of guarantee amount           5.00%  
Letters of guarantee outstanding, amount           S/ 1,580,126,000 $ 395,229,000
Monthly interest rate (in percent)       0.72% 0.80%    
Year 2007 and 2008              
Disclosure of Commitments and contingencies [Line Items]              
Amount of tax liability paid S/ 1,584,227,000 $ 398,548,000          
Amount of tax liability interest paid 78,279,000 19,693,000          
Year 2009 [Member]              
Disclosure of Commitments and contingencies [Line Items]              
Amount of tax liability paid 193,398,000 48,654,000          
Amount of tax liability interest paid 8,477,000 2,133,000          
Year 2010 [Member]              
Disclosure of Commitments and contingencies [Line Items]              
Amount of tax liability paid 356,691,000   $ 89,733,000        
Amount of tax liability interest paid S/ 16,762,000 $ 4,217,000