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Share-based payments - Disclosure of assumptions used for the measurement of AGAs (Details) - € / shares | Sep. 05, 2024 | Jul. 11, 2024 | May 23, 2024 | Mar. 28, 2024 | Jan. 02, 2024 | Dec. 01, 2023 | Sep. 28, 2023 | Jul. 11, 2023 | Sep. 30, 2021
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AGA 2021 |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) |  |  |  |  |  |  |  |  | € 31.60
FAIR VALUE OF THE AGA (in euro per share) |  |  |  |  |  |  |  |  | 23.92
AGA PRICE (in euro per share) |  |  |  |  |  |  |  |  | € 0.00
VOLATILITY |  |  |  |  |  |  |  |  | 49.00%
RISK FREE RATE |  |  |  |  |  |  |  |  | (1.00%)
AGA-2023-1 | Tranches 1-4 |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) |  |  |  |  |  |  |  | € 15.98 |
FAIR VALUE OF THE AGA (in euro per share) |  |  |  |  |  |  |  | 15.98 |
AGA PRICE (in euro per share) |  |  |  |  |  |  |  | 0.00 |
AGA-2023-1 | Tranche 5 |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) |  |  |  |  |  |  |  | 15.98 |
FAIR VALUE OF THE AGA (in euro per share) |  |  |  |  |  |  |  | 3.62 |
AGA PRICE (in euro per share) |  |  |  |  |  |  |  | € 0.00 |
VOLATILITY |  |  |  |  |  |  |  | 67.20% |
RISK FREE RATE |  |  |  |  |  |  |  | 3.20% |
AGA-2023-1 | Tranche 6 |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) |  |  |  |  |  |  |  | € 15.98 |
FAIR VALUE OF THE AGA (in euro per share) |  |  |  |  |  |  |  | 0.74 |
AGA PRICE (in euro per share) |  |  |  |  |  |  |  | € 0.00 |
VOLATILITY |  |  |  |  |  |  |  | 67.20% |
RISK FREE RATE |  |  |  |  |  |  |  | 3.20% |
AGA-2023-2 | Tranche 1 |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) |  |  |  |  |  |  |  | € 15.98 |
FAIR VALUE OF THE AGA (in euro per share) |  |  |  |  |  |  |  | 15.98 |
AGA PRICE (in euro per share) |  |  |  |  |  |  |  | 0.00 |
AGA-2023-2 | Tranche 2 |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) |  |  |  |  |  |  |  | 15.98 |
FAIR VALUE OF THE AGA (in euro per share) |  |  |  |  |  |  |  | 9.59 |
AGA PRICE (in euro per share) |  |  |  |  |  |  |  | € 0.00 |
AGA-2023-3 |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) |  |  |  |  |  |  | € 14.92 |  |
FAIR VALUE OF THE AGA (in euro per share) |  |  |  |  |  |  | 14.92 |  |
AGA PRICE (in euro per share) |  |  |  |  |  |  | 0.00 |  |
AGA-2023-4 |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) |  |  |  |  |  |  | 14.92 |  |
FAIR VALUE OF THE AGA (in euro per share) |  |  |  |  |  |  | 14.92 |  |
AGA PRICE (in euro per share) |  |  |  |  |  |  | € 0.00 |  |
AGA-2023-5 |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) |  |  |  |  |  | € 9.16 |  |  |
FAIR VALUE OF THE AGA (in euro per share) |  |  |  |  |  | 9.16 |  |  |
AGA PRICE (in euro per share) |  |  |  |  |  | € 0.00 |  |  |
AGA-2024-1 |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) |  |  |  |  | € 12.26 |  |  |  |
FAIR VALUE OF THE AGA (in euro per share) |  |  |  |  | 12.26 |  |  |  |
AGA PRICE (in euro per share) |  |  |  |  | € 0.00 |  |  |  |
AGA-2024-2 |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) |  |  |  | € 13.40 |  |  |  |  |
FAIR VALUE OF THE AGA (in euro per share) |  |  |  | 13.40 |  |  |  |  |
AGA PRICE (in euro per share) |  |  |  | € 0.00 |  |  |  |  |
AGA-2024-3 |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) |  |  | € 12.76 |  |  |  |  |  |
FAIR VALUE OF THE AGA (in euro per share) |  |  | 12.76 |  |  |  |  |  |
AGA PRICE (in euro per share) |  |  | € 0.00 |  |  |  |  |  |
AGA-2024-4 |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) |  | € 12.54 |  |  |  |  |  |  |
FAIR VALUE OF THE AGA (in euro per share) |  | 12.54 |  |  |  |  |  |  |
AGA PRICE (in euro per share) |  | 0.00 |  |  |  |  |  |  |
AGA-2024-5 |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) |  | 12.54 |  |  |  |  |  |  |
FAIR VALUE OF THE AGA (in euro per share) |  | 12.54 |  |  |  |  |  |  |
AGA PRICE (in euro per share) |  | 0.00 |  |  |  |  |  |  |
AGA-2024-6 |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) |  | 12.54 |  |  |  |  |  |  |
FAIR VALUE OF THE AGA (in euro per share) |  | 12.54 |  |  |  |  |  |  |
AGA PRICE (in euro per share) |  | € 0.00 |  |  |  |  |  |  |
AGA-2024-7 |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) | € 10.80 |  |  |  |  |  |  |  |
FAIR VALUE OF THE AGA (in euro per share) | 10.80 |  |  |  |  |  |  |  |
AGA PRICE (in euro per share) | € 0.00 |  |  |  |  |  |  |  |

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