Balance Sheet Accounts - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense for property and equipment	$ 4.8	$ 3.8
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, reclassification	162.7	76.0
Construction In Progress Reclassified To Building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, reclassification	(162.7)
Manufacturing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, reclassification	$ 2.6
Manufacturing equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life	7 years
Manufacturing equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life	10 years
Construction In Progress Reclassified To Manufacturing Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, reclassification	$ (2.6)
Manufacturing Facility
Property, Plant and Equipment [Line Items]
Useful life	39 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, reclassification		$ (76.0)