Revenue from Contracts with Customers - Disaggregated By Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 286,586	$ 220,227	$ 536,089	$ 430,727
North America
Disaggregation of Revenue [Line Items]
Total revenue	105,643	85,887	203,376	166,118
Asia/Pacific/Other
Disaggregation of Revenue [Line Items]
Total revenue	132,278	105,014	244,052	208,553
Rest of Europe
Disaggregation of Revenue [Line Items]
Total revenue	$ 48,665	$ 29,326	$ 88,661	$ 56,056