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Warrants - Narrative (Details)
€ in Thousands
7 Months Ended 12 Months Ended
Mar. 31, 2021
EUR (€)
$ / shares
shares
Mar. 31, 2022
EUR (€)
shares
Mar. 31, 2021
EUR (€)
shares
Mar. 31, 2020
EUR (€)
shares
Mar. 31, 2019
EUR (€)
shares
Warrants [Line Items]          
Warrant liability | € € 30,979 € 12,051 € 30,979 € 0 € 0
Public warrants to shares purchase ratio (in shares per warrant)     1    
Warrants          
Warrants [Line Items]          
Number of warrants outstanding (in shares) | shares 30,735,950 30,735,950 30,735,950 0 0
Warrant liability | € € 31,000 € 12,100 € 31,000 € 0  
Public warrants          
Warrants [Line Items]          
Exercises of warrants (in shares) | shares 114,024 0      
Weighted average exercise price of other equity instruments exercised (usd per share) | $ / shares € 11.50