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Financial Instruments and Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest income		$ 6.0	$ 12.0	$ 9.4
Impairment charges		10.6	$ 0.0	$ 2.5
Cost of Sales
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairment charges		6.3
Research and development expense
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairment charges		$ 4.3
Customer Concentration Risk \| Revenues \| Three Customers in Aggregate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk percentage		41.50%	41.30%	40.20%
Customer Concentration Risk \| Accounts Receivable \| One Customer
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk percentage	11.20%