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Corporate information (Details Narrative) - PEN (S/) S/ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 01, 2017 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 13, 2017 | Dec. 13, 2016 | Aug. 02, 2016 | Jul. 31, 2016 | Feb. 29, 2016 | Feb. 02, 2016 | Dec. 31, 2015 | Sep. 25, 2015 | Jul. 14, 2015 | Jun. 04, 2015
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital stock |  |  | S/ 423,868 | S/ 531,461 |  |  |  |  |  |  |  |  |  |
Investment shares |  |  | 40,279 | 50,503 |  |  |  |  |  |  |  |  |  |
Additional paid-in capital |  |  | 432,779 | 545,165 |  |  |  |  |  |  |  |  |  |
Other reserves |  |  | (43,699) | (16,602) |  |  |  |  |  |  |  |  |  |
Non-controlling interest |  |  | 148 | 112,589 |  |  |  |  |  |  |  |  |  |
Description of shares received upon spin-off |  | The project contemplates that for each common and investment share of the Company, each shareholder will receive approximately 0.20 common and investment shares of Fossal S.A.A. and approximately 0.80 common and investment shares of Cementos Pacasmayo S.A.A. |  |  |  |  |  |  |  |  |  |  |  |
Quimpac S.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital stock |  |  | S/ 490 | S/ 473 |  |  |  |  |  |  | S/ 277 |  |  |
Salmueras Sudamericanas S.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of holding interests in subsidiary |  |  | 25.10% | 25.10% |  |  |  |  |  |  |  |  |  |
Capital stock |  |  |  |  | S/ 3,467 | S/ 783 |  |  |  | S/ 4,100 |  |  |  | S/ 2,400
Non-controlling interest |  |  | S/ 147 | S/ 11,867 |  |  |  |  |  |  |  |  |  |
Salmueras Sudamericanas S.A. [Member] | Quimpac S.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of holding interests in subsidiary |  |  | 25.10% |  |  |  |  |  |  |  |  |  |  |
Fosfatos del Pacifico S.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of holding interests in subsidiary |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |
Decrease in capital stock | S/ 107,593 |  |  |  |  |  |  |  |  |  |  |  |  |
Capital stock | 107,593 | S/ 1,200 |  |  |  |  | S/ 13,384 | S/ 1,000 | S/ 23,216 |  |  | S/ 15,813 | S/ 78,178 |
Investment shares | 10,224 |  |  |  |  |  |  |  |  |  |  |  |  |
Additional paid-in capital | 118,569 |  |  |  |  |  |  |  |  |  |  |  |  |
Other reserves | 36,957 |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest | S/ 100,357 |  |  | S/ 100,722 |  |  |  |  |  |  |  |  |  |
Inversiones ASPI S.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of holding interests in subsidiary |  |  | 50.01% | 50.01% |  |  |  |  |  |  |  |  |  |

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