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Events after the reporting period (Details)
$ / shares in Units, € in Thousands, $ in Thousands
12 Months Ended
Jun. 14, 2022
EUR (€)
Jun. 14, 2022
USD ($)
May 05, 2022
EUR (€)
shares
May 05, 2022
USD ($)
shares
Apr. 19, 2022
EUR (€)
Apr. 19, 2022
USD ($)
Apr. 01, 2022
EUR (€)
Apr. 01, 2022
USD ($)
Mar. 31, 2022
EUR (€)
Mar. 31, 2021
EUR (€)
Mar. 31, 2020
EUR (€)
May 05, 2022
transaction
SFr / shares
May 05, 2022
transaction
$ / shares
Disclosure of non-adjusting events after reporting period [line items]                          
Proceeds from loans and borrowings | €                 € 0 € 630,000 € 0    
Proceeds from issuance of share capital | €                 € 0 € 58,721 € 0    
Major Investment Agreement | CK Opportunities Fund I, LP                          
Disclosure of non-adjusting events after reporting period [line items]                          
Proceeds from issuance of share capital € 215,200 $ 225,000                      
Major Investment Agreement | CK Opportunities Fund I, LP | Preference shares                          
Disclosure of non-adjusting events after reporting period [line items]                          
Par value per share (in swiss franc per share) | SFr / shares                       SFr 0.01  
Number of shares issued (in shares) | shares     21,176,470 21,176,470                  
Purchase price per share (in USD per share) | $ / shares                         $ 8.50
Major Investment Agreement | CK Opportunities Fund I, LP | Ordinary shares                          
Disclosure of non-adjusting events after reporting period [line items]                          
Par value per share (in swiss franc per share) | SFr / shares                       SFr 0.01  
Number of shares issued (in shares) | shares     8,587,786 8,587,786                  
Purchase price per share (in USD per share) | $ / shares                         $ 5.24
Number of private transactions | transaction                       1 1
Major Investment Agreement | CK Opportunities Fund I, LP | Maximum | Preference shares                          
Disclosure of non-adjusting events after reporting period [line items]                          
Proceeds from issuance of share capital     € 172,200 $ 180,000                  
Major Investment Agreement | CK Opportunities Fund I, LP | Maximum | Ordinary shares                          
Disclosure of non-adjusting events after reporting period [line items]                          
Proceeds from issuance of share capital     € 43,000 $ 45,000                  
Supplementary Liquidity Facility | Major Financing Transaction                          
Disclosure of non-adjusting events after reporting period [line items]                          
Proceeds from loans and borrowings         € 41,400 $ 45,000 € 18,000 $ 20,000