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Commitments and contingencies - Open tax procedures - Vl (Details) - Year 2009 [Member] - Twenty-Second Administrative Litigation Court
 1 Months Ended
Jan. 14, 2020
PEN (S/)
May 31, 2019
PEN (S/)
Jan. 14, 2020
USD ($)
May 31, 2019
USD ($)
Disclosure of Commitments and contingencies [Line Items]        
Percentage of injunction of tax debt   60.00%    
Letters of guarantee outstanding, amount   S/ 171,791,000   $ 47,404,000
Validity of letter of guarantee   12 months    
New guarantee contract        
Disclosure of Commitments and contingencies [Line Items]        
Percentage of injunction of tax debt 60.00%      
Tax debt S/ 196,485,000   $ 54,218,000  
Letters of guarantee outstanding, amount S/ 117,891,000   $ 32,531,000