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Investee Companies and other investments (Equity Accounted Investees) (Narrative) (Details) € in Thousands, ₪ in Thousands, $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Feb. 12, 2019 ILS (₪) | Feb. 12, 2019 EUR (€) | Oct. 01, 2017 | Dec. 08, 2016 | May 12, 2014 | Mar. 31, 2020 ILS (₪) | Mar. 31, 2020 EUR (€) | Jun. 30, 2019 ILS (₪) | Jun. 30, 2019 EUR (€) | Nov. 30, 2018 ILS (₪) | Nov. 30, 2018 EUR (€) | Jan. 31, 2018 ILS (₪) | Jan. 31, 2018 EUR (€) | Jul. 25, 2016 ILS (₪) | Jul. 16, 2015 | Nov. 25, 2010 | Dec. 31, 2019 ILS (₪) | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 ILS (₪) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 EUR (€) | Dec. 23, 2019 | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 24, 2018 | Jan. 15, 2018 | Apr. 02, 2017 ILS (₪) | Apr. 02, 2017 EUR (€) | Feb. 23, 2017 USD ($) | Jul. 25, 2016 EUR (€)
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% | 3.50% |  |  |  |  | 3.50% | 3.50% |  |  |  |  |  |
Project development costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 4,213 |  | € 2,878 | € 2,739 |  |  |  |  |  |  |  |  |
Manara [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project development costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 3,500 |  |  |  |  |  |  |  |  |  |  |  |
Biogas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discounted rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.60% | 6.60% |  |  |  |  |  |  |  |  |  |  |  |
Dorad Energy Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of shareholders loan |  |  |  |  |  |  |  |  | € 896 |  | € 26,040 |  | € 19,265 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from subsidiaries |  |  |  |  |  |  |  |  | € 360 |  |  |  |  |  |  |  |  |  |  | € 4,576 |  |  |  |  |  |  |  |  |  |
Claims amount payment | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 183,368 |
Percentage of production increase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.30% | 6.00% |  |  |  |
Edelsburg Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses paid to Zorlu | ₪ | ₪ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NIS [Member] | Dorad Energy Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of shareholders loan | ₪ |  |  |  |  |  |  |  | ₪ 19,000 |  | ₪ 110,000 |  | ₪ 80,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from subsidiaries | ₪ |  |  |  |  |  |  |  | 1,500 |  |  |  |  |  |  |  |  |  |  | ₪ 19,250 |  |  |  |  |  |  |  |  |  |  |
NIS [Member] | Dorad Energy Ltd [Member] | Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of shareholders loan |  |  |  |  |  |  |  |  |  |  | 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NIS [Member] | Dori Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of shareholders loan | ₪ |  |  |  |  |  |  |  | ₪ 3,733 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Euro [Member] | Dorad Energy Ltd [Member] | Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of shareholders loan |  |  |  |  |  |  |  |  |  |  | € 466 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Euro [Member] | Edelsburg Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses paid to Zorlu |  | € 2,430 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dorad Energy Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of share capital holds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued production licenses |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
License expiration date |  |  |  |  | May 11, 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 9.375% | 9.375% |  |  |  |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |
Senior debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.10% | 5.10% |  |  |  |  |  |  |  |  |  |  |  |
Amount received for payment of loan |  |  |  |  |  |  | € 5,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of shareholders loan |  |  |  |  |  |  | 2,643 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount financial agreement guarantees by direct share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 44,093 |  |  |  |  |  |  |  |  |  |  |  |
Amount financial agreement guarantees by indirect share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 4,134 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of average production reduced |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.90% |  |  |  |  |  |  |  |
Dividend distribution amount |  |  |  |  |  |  | € 31,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dorad Energy Ltd [Member] | NIS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount received for payment of loan | ₪ |  |  |  |  |  | ₪ 22,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of shareholders loan | ₪ |  |  |  |  |  | 10,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount financial agreement guarantees by direct share | ₪ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₪ 171,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount financial agreement guarantees by indirect share | ₪ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₪ 16,031 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend distribution amount | ₪ |  |  |  |  |  | ₪ 120,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dori Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of share capital holds |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |
Shareholders loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 10,618 |  |  |  |  |  |  |  |  |  |  |  |
Percentage decrease from Dorad Holding |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dori Energy [Member] | NIS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders loans | ₪ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₪ 41,177 |  |  |  |  |  |  |  |  |  |  |  |  |
Zorlu Enerji Elektrik Uretim A.S [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of share capital holds |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Luzon Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of share capital holds |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claims amount payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 218,000 |  |
Payment received for management and entrepreneurship services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 11,900
Luzon Group [Member] | NIS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claims amount payment | ₪ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₪ 906,400 |  |  |
Payment received for management and entrepreneurship services | ₪ |  |  |  |  |  |  |  |  |  |  |  |  |  | ₪ 49,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery of amounts committed | ₪ |  |  |  |  |  |  |  |  |  |  |  |  |  | ₪ 49,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eilat Ashkelon Infrastructure Services Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of share capital holds |  |  | 37.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Edelcom Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of share capital holds |  |  |  |  |  |  |  |  |  |  |  |  |  | 18.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Zorlu [Member] | Euro [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claims amount payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 123,000 |  |  |  |  |  |
Claims interest payment amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,000 |  |  |  |  |  |
Zorlu [Member] | USD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claims amount payment | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 140,000 |  |  |  |  |  |  |
Claims interest payment amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,000 |  |  |  |  |  |  |
Dorad [Member] | Euro [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Refund amount to Dorad |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 21,000 |  |  |  |  |  |
Dorad [Member] | USD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Refund amount to Dorad | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24,000 |  |  |  |  |  |  |

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