Segment and Geographic Information - Reconciliation of Reportable Segment Assets to Corresponding Consolidated Amounts (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Cash and cash equivalents, restricted cash, and marketable securities	$ 2,507,326	$ 244,012
Deferred tax asset	1,926	10,043
Other assets	17,244	11,237
Assets held for sale		495,213
Assets	3,722,717	1,819,512
Operating Segments
Segment Reporting Information [Line Items]
Assets	$ 1,196,221	$ 1,059,007