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Inventories (Details 1) - PEN (S/)
S/ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Provision For Inventory Obsolescence And Net Realizable Value [Roll Forward]      
Opening balance S/ 6,684 [1] S/ 14,055 S/ 5,146
Additions 3,183 1,725 9,335
Recoveries (465) (226) (426)
Disposals   (8,870)  
Final balance S/ 9,402 [1] S/ 6,684 [1] S/ 14,055
[1] Movement in the provision for inventory obsolescence and net realizable value is set forth below: