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Significant accounting policies - Going Concern (Details)
€ in Thousands, $ in Millions
12 Months Ended
Jun. 14, 2022
EUR (€)
Jun. 14, 2022
USD ($)
Mar. 31, 2022
EUR (€)
Mar. 31, 2021
EUR (€)
Mar. 31, 2020
EUR (€)
Disclosure of non-adjusting events after reporting period [line items]          
Proceeds from issuance of share capital     € 0 € 58,721 € 0
CK Opportunities Fund I, LP | Major Investment Agreement          
Disclosure of non-adjusting events after reporting period [line items]          
Proceeds from issuance of share capital € 215,200 $ 225.0