Segment and Geographic Information - Summary of Revenue for Geographic Regions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	$ 462,474	$ 435,668	$ 1,425,422	$ 1,326,504
Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	462,474	435,668	1,425,422	1,326,504
Americas | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	193,043	180,154	608,924	562,763
Europe | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	176,419	159,558	561,690	524,354
Asia-Pacific | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenue	$ 93,012	$ 95,956	$ 254,808	$ 239,387