Segments - Summary of Reconcilaition of Segment Assets to Total Consolidated Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 1,878,405	$ 1,550,992
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Segment assets	477,848	332,621
All other	1,400,557	1,218,371
Total assets	1,878,405	1,550,992
Operating Segments | Americas
Segment Reporting, Asset Reconciling Item [Line Items]
Segment assets	204,554	164,905
Operating Segments | EMEA
Segment Reporting, Asset Reconciling Item [Line Items]
Segment assets	228,018	104,219
Operating Segments | APAC
Segment Reporting, Asset Reconciling Item [Line Items]
Segment assets	45,276	63,497
Corporate/Other
Segment Reporting, Asset Reconciling Item [Line Items]
Segment assets	$ 0	$ 0