Segment and Geographic Information - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2021
Geographic Information
Revenue from Contract with Customer, Excluding Assessed Tax	$ 405,296	$ 1,044,178		$ 300,640
Property, equipment and leasehold improvements, net	17,148	18,670	$ 17,148
Interest Income (Expense), Net	3,494	31,917	3,222	(115)
United States
Geographic Information
Revenue from Contract with Customer, Excluding Assessed Tax	173,500	387,800		123,200
Property, equipment and leasehold improvements, net	13,000	13,400	13,000
Americas
Geographic Information
Revenue from Contract with Customer, Excluding Assessed Tax	234,383	486,506		182,314
Property, equipment and leasehold improvements, net	14,591	15,793	14,591
Europe
Geographic Information
Revenue from Contract with Customer, Excluding Assessed Tax	84,958	275,698		58,026
Property, equipment and leasehold improvements, net	1,403	954	1,403
Asia, Middle East and Africa
Geographic Information
Revenue from Contract with Customer, Excluding Assessed Tax	85,955	281,974		$ 60,300
Property, equipment and leasehold improvements, net	$ 1,154	$ 1,923	$ 1,154