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Financial instruments - Fair values and risk management - Sensitivity analysis (Details) - EUR (€) € in Millions | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Interest rate risk |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Percentage of reasonably possible increase in risk assumption | 1.00% |  |
Percentage of reasonably possible decrease in risk assumption | 1.00% |  |
Changes in profit loss due to increase in risk component | € 6.0 |  |
Changes in profit loss due to decrease in risk component | 48.0 | € 38.0 | € 5.0
Changes in equity due to increase in risk component | 0.0 | 0.0 | 0.0
Changes in equity due to decrease in risk component | € 0.0 | € 0.0 | € 0.0
Foreign currency risk |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Percentage of reasonably possible increase in risk assumption | 10.00% | 10.00% | 10.00%
Percentage of reasonably possible decrease in risk assumption | 10.00% | 10.00% | 10.00%
Changes in profit loss due to increase in risk component | € 40.0 | € 246.0 | € 0.0
Changes in profit loss due to decrease in risk component | (33.0) | (235.0) | 0.0
Changes in equity due to increase in risk component | (372.0) | 649.0 | 894.0
Changes in equity due to decrease in risk component | € 304.0 | (531.0) | € (731.0)
Jet fuel risk |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Percentage of reasonably possible increase in risk assumption | 10.00% |  |
Percentage of reasonably possible decrease in risk assumption | 10.00% |  |
Changes in profit loss due to increase in risk component | € 0.0 | 26.0 |
Changes in profit loss due to decrease in risk component | 0.0 | 26.0 |
Changes in equity due to increase in risk component | 0.0 | 31.0 |
Changes in equity due to decrease in risk component | € 0.0 | € 31.0 |

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