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Financial Assets and Liabilities - Additional Information (Detail) € / shares in Units, $ / shares in Units, € in Thousands |  | 1 Months Ended | 3 Months Ended |  |
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Sep. 03, 2024 USD ($) Multiple | Sep. 30, 2024 EUR (€) XBB | Sep. 30, 2024 USD ($) XBB | Sep. 30, 2023 EUR (€) XBB Multiple | Sep. 30, 2023 USD ($) XBB Multiple | Mar. 31, 2022 EUR (€) | Mar. 31, 2022 USD ($) | Mar. 31, 2025 EUR (€) Days € / shares | Mar. 31, 2025 USD ($) $ / shares | Dec. 31, 2024 EUR (€) € / shares
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Derivative liabilities | € |  |  |  |  |  |  |  | € 174,581 |  | € 150,670
Share price | € / shares |  |  |  |  |  |  |  | € 49.7 |  | € 49.6
Royalty Pharma U.S. Skytrofa [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Funding received in exchange of royalty payments |  |  |  |  | $ 150,000,000 |  |  |  |  |
Funding received in exchange of royalty payments |  |  |  |  | 150,000,000 |  |  |  |  |
Net proceeds after deduting offering expenses |  |  |  | € 136,300 | $ 146,300,000 |  |  |  |  |
Net revenue from sales interest payment in percentage in exchange for funding |  |  |  | 9.15% | 9.15% |  |  |  |  |
Royalty payment beginning period |  |  |  | Jan. 01, 2025 | Jan. 01, 2025 |  |  |  |  |
Royalty payment ending period |  |  |  | Dec. 31, 2031 | Dec. 31, 2031 |  |  |  |  |
Amount multiplied to purchase price minus revenue interest payments paid to purchaser on effective date of buy-out notice as buyout amount | XBB |  |  |  | 1.925 | 1.925 |  |  |  |  |
Amount multiplied to purchase price minus revenue interest payments paid to purchaser on effective date of buy-out notice provided on or prior to period as buyout amount | XBB |  |  |  | 1.65 | 1.65 |  |  |  |  |
Royalty Pharma U.S. Skytrofa [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Multiple of the purchase price were royalty payment will cease | Multiple |  |  |  | 1.65 | 1.65 |  |  |  |  |
Royalty Pharma U.S. Skytrofa [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Multiple of the purchase price were royalty payment will cease | Multiple |  |  |  | 1.925 | 1.925 |  |  |  |  |
Royalty Pharma U.S. Yorvipath [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Funding received in exchange of royalty payments | $ 150,000,000 |  |  |  |  |  |  |  |  |
Funding received in exchange of royalty payments |  |  | $ 150,000,000 |  |  |  |  |  |  |
Net proceeds after deduting offering expenses |  | € 134,200 | $ 148,200,000 |  |  |  |  |  |  |
Net revenue from sales interest payment in percentage in exchange for funding | 3.00% |  |  |  |  |  |  |  |  |
Royalty payment ending period | Dec. 31, 2029 |  |  |  |  |  |  |  |  |
Amount multiplied to purchase price minus revenue interest payments paid to purchaser on effective date of buy-out notice as buyout amount | XBB |  | 2 | 2 |  |  |  |  |  |  |
Amount multiplied to purchase price minus revenue interest payments paid to purchaser on effective date of buy-out notice provided on or prior to period as buyout amount | XBB |  | 1.65 | 1.65 |  |  |  |  |  |  |
Royalty Pharma U.S. Yorvipath [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Multiple of the purchase price were royalty payment will cease | Multiple | 1.65 |  |  |  |  |  |  |  |  |
Royalty Pharma U.S. Yorvipath [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Multiple of the purchase price were royalty payment will cease | Multiple | 2 |  |  |  |  |  |  |  |  |
Historical volatility for shares, measurement input [member] | Derivatives [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities |  |  |  |  |  |  |  | 10.00% | 10.00% |
Percentage of reasonably possible decrease in unobservable input, liabilities |  |  |  |  |  |  |  | 10.00% | 10.00% |
Share Price Measurement Input [Member] | Derivatives [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Increase decrease in derivative financial liabilities fair value | € |  |  |  |  |  |  |  | € 35,300 |  |
Percentage of reasonably possible increase in unobservable input, liabilities |  |  |  |  |  |  |  | 10.00% | 10.00% |
Percentage of reasonably possible decrease in unobservable input, liabilities |  |  |  |  |  |  |  | 10.00% | 10.00% |
Foreign Currency Conversion Option [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Increase decrease in derivative financial liabilities fair value | € |  |  |  |  |  |  |  | € 15,000 |  |
American depository shares [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Conversion price per share | $ / shares |  |  |  |  |  |  |  |  | $ 166.34 |
Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Conversion rate per note | $ / shares |  |  |  |  |  |  |  |  | $ 6.0118 |
Principal amount |  |  |  |  |  |  | $ 575,000,000 |  |  |
Borrowings redemption period |  |  |  |  |  |  |  | April 7, 2025 |  |
Borrowings condition for redemption |  |  |  |  |  |  |  | but only if the last reported sale price per ADS exceeds 130% of the conversion price on (i) each of at least 20 trading days, whether or not consecutive, during the 30 consecutive trading days ending on, and including, the trading day immediately before the date the Company sends the related optional redemption notice; and (ii) the trading day immediately before the date the Company sends such notice. |  |
Borrowings threshold percentage of sale price per share for redemption |  |  |  |  |  |  |  | 130.00% |  |
Borrowings threshold trading days for redemption | Days |  |  |  |  |  |  |  | 20 |  |
Borrowings threshold consecutive trading days for redemption | Days |  |  |  |  |  |  |  | 30 |  |
Proceeds from issue of bonds, notes and debentures |  |  |  |  |  | € 503,300 | $ 557,900,000 |  |  |
Borrowings, maturity |  |  |  |  |  | April 1, 2028 | April 1, 2028 |  |  |
Convertible Senior Notes [Member] | American depository shares [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 1,000 |
Fixed interest rate [member] | Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Borrowings Interest Rate |  |  |  |  |  |  | 2.25% | 2.25% | 2.25% |

X
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