Segment and Geographic Information - Revenue By Geographic Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	$ 465,910	$ 457,721
Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	465,910	457,721
Americas | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	226,912	212,881
Europe | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	167,210	162,308
Asia-Pacific | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	$ 71,788	$ 82,532