Segment and Geographic Information - Revenue By Geographic Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	$ 505,227	$ 461,785	$ 962,948	$ 890,836
Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	505,227	461,785	962,948	890,836
Americas | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	202,999	180,329	415,880	382,609
Europe | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	79,265	202,477	161,797	364,796
Asia-Pacific | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	$ 222,963	$ 78,979	$ 385,271	$ 143,431