Revenue from Contracts with Customers - Revenue By Geographic Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	$ 550,214	$ 465,910
Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	550,214	465,910
Americas | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	267,267	226,912
Europe | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	196,953	167,210
Asia-Pacific | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	$ 85,994	$ 71,788