Leases - Narrative (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Nov. 19, 2021 USD ($) ft² option	Jun. 30, 2023 USD ($) ft² option	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) ft² option	Jun. 30, 2022 USD ($)	Dec. 23, 2022
Lessee Lease Description [Line Items]
Estimated lease payments		$ 147,317		$ 147,317
Short-term lease cost		600	$ 200	1,200	$ 700
Research Facility in San Diego | California
Lessee Lease Description [Line Items]
Lease term	15 years
Office space leases (in sq ft) | ft²	144,000
Estimated lease payments	$ 119,000
Estimated payments for operating expenses	3,000
Payments for leasehold improvements, net of tenant improvement allowances	$ 32,000
Operating lease renewal term	10 years
Maximum additional tenant improvement allowance		7,200		7,200
Additional tenant improvement allowance liability		$ 700		$ 700
Additional tenant improvement allowance interest per annum		7.00%		7.00%
Research Facility in San Diego | California | Sorrento Valley Owner (DE) LLC
Lessee Lease Description [Line Items]
Lease term						6 months
Research Facility in San Diego | California | Maximum
Lessee Lease Description [Line Items]
Number of options to renew | option	1
Corporate Headquarters In Pasadena | California
Lessee Lease Description [Line Items]
Office space leases (in sq ft) | ft²	49,000
Corporate Headquarters In Pasadena | California | Colorado Owner, LLC
Lessee Lease Description [Line Items]
Number of options to renew | option		1		1
Operating lease renewal term		5 years		5 years
Research Facility in Madison | Wisconsin
Lessee Lease Description [Line Items]
Office space leases (in sq ft) | ft²		111,000		111,000
Number of options to renew | option		2		2
Operating lease renewal term		5 years		5 years