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