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U.S. and Europe Retrospective Responsibility Plans - Additional Details (Details) € in Millions, $ in Billions |  | 9 Months Ended
--- | --- | ---
Jul. 19, 2024 USD ($) shares | Jun. 30, 2024 EUR (€)
Class of Stock [Line Items] |  |
VE covered loss, maximum amount of loss to allow adjustment of conversion rate during six-month period | € |  | € 20
Subsequent Event |  |
Class of Stock [Line Items] |  |
Preferred stock, conversion ratio, denominator (in shares) | 100 |
Series B Preferred Stock And Series C Preferred Stock | Subsequent Event |  |
Class of Stock [Line Items] |  |
Preferred stock released | $ | $ 2.7 |
Series A preferred stock | Subsequent Event |  |
Class of Stock [Line Items] |  |
Stock issued during the period, new issues (in shares) | 99,264 |
Series B preferred stock | Subsequent Event |  |
Class of Stock [Line Items] |  |
Preferred stock, conversion rate, downward adjustment | 1.6950 |
Series C preferred stock | Subsequent Event |  |
Class of Stock [Line Items] |  |
Preferred stock, conversion rate, downward adjustment | 1.8190 |

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