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Financial Instruments and Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Concentration Risk [Line Items]
Interest income		$ 1.5	$ 3.1	$ 4.6	$ 9.4
Impairment of property, plant and equipment				10.6	$ 0.0
Cost of products sold
Concentration Risk [Line Items]
Impairment of property, plant and equipment				6.3
Research and development expense
Concentration Risk [Line Items]
Impairment of property, plant and equipment				$ 4.3
Customer Concentration Risk | Revenues | Three Customers In Aggregate
Concentration Risk [Line Items]
Concentration risk percentage		40.70%		41.20%
Customer Concentration Risk | Trade Receivables | Two Customers In Aggregate
Concentration Risk [Line Items]
Concentration risk percentage	29.10%

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